Update GitHub Skills format for accessibility

.github/steps/0-welcome.md

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+<!-- readme -->

.github/steps/1-create-a-branch.md

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+<!--
+  <<< Author notes: Step 1 >>>
+  Choose 3-5 steps for your course.
+  The first step is always the hardest, so pick something easy!
+  Link to docs.github.com for further explanations.
+  Encourage users to open new tabs for steps!
+-->
+
+## Step 1: Create a branch
+
+_Welcome to "Introduction to GitHub"! :wave:_
+
+**What is GitHub?**: GitHub is a collaboration platform that uses _[Git](https://docs.github.com/get-started/quickstart/github-glossary#git)_ for versioning. GitHub is a popular place to share and contribute to [open-source](https://docs.github.com/get-started/quickstart/github-glossary#open-source) software.
+<br>:tv: [Video: What is GitHub?](https://www.youtube.com/watch?v=pBy1zgt0XPc)
+
+**What is a repository?**: A _[repository](https://docs.github.com/get-started/quickstart/github-glossary#repository)_ is a project containing files and folders. A repository tracks versions of files and folders. For more information, see "[About repositories](https://docs.github.com/en/repositories/creating-and-managing-repositories/about-repositories)" from GitHub Docs.
+
+**What is a branch?**: A _[branch](https://docs.github.com/en/get-started/quickstart/github-glossary#branch)_ is a parallel version of your repository. By default, your repository has one branch named `main` and it is considered to be the definitive branch.  Creating additional branches allows you to copy the `main` branch of your repository and safely make any changes without disrupting the main project. Many people use branches to work on specific features without affecting any other parts of the project.
+
+Branches allow you to separate your work from the `main` branch. In other words, everyone's work is safe while you contribute. For more information, see "[About branches](https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/about-branches)".
+
+**What is a profile README?**: A _[profile README](https://docs.github.com/account-and-profile/setting-up-and-managing-your-github-profile/customizing-your-profile/managing-your-profile-readme)_ is essentially an "About me" section on your GitHub profile where you can share information about yourself with the community on GitHub.com. GitHub shows your profile README at the top of your profile page. For more information, see "[Managing your profile README](https://docs.github.com/en/account-and-profile/setting-up-and-managing-your-github-profile/customizing-your-profile/managing-your-profile-readme)".
+
+![profile-readme-example](/images/profile-readme-example.png)
+
+### :keyboard: Activity: Your first branch
+
+1. Open a new browser tab and navigate to your newly made repository. Then, work on the steps in your second tab while you read the instructions in this tab.
+2. Navigate to the **< > Code** tab in the header menu of your repository.
+
+   ![code-tab](/images/code-tab.png)
+
+3. Click on the **main** branch drop-down.
+
+   ![main-branch-dropdown](/images/main-branch-dropdown.png)
+
+4. In the field, enter a name for your branch: `my-first-branch`.
+5. Click **Create branch: my-first-branch** to create your branch.
+
+   ![create-branch-button](/images/create-branch-button.png)
+
+   The branch will automatically switch to the one you have just created.
+   The **main** branch drop-down bar will reflect your new branch and display the new branch name.
+
+6. Wait about 20 seconds then refresh this page (the one you're following instructions from). [GitHub Actions](https://docs.github.com/en/actions) will automatically update to the next step.

.github/steps/2-commit-a-file.md

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+<!--
+  <<< Author notes: Step 2 >>>
+  Start this step by acknowledging the previous step.
+  Define terms and link to docs.github.com.
+-->
+
+## Step 2: Commit a file
+
+_You created a branch! :tada:_
+
+Creating a branch allows you to edit your project without changing the `main` branch. Now that you have a branch, it’s time to create a file and make your first commit!
+
+**What is a commit?**: A _[commit](https://docs.github.com/pull-requests/committing-changes-to-your-project/creating-and-editing-commits/about-commits)_ is a set of changes to the files and folders in your project. A commit exists in a branch. For more information, see "[About commits](https://docs.github.com/en/pull-requests/committing-changes-to-your-project/creating-and-editing-commits/about-commits)".
+
+### :keyboard: Activity: Your first commit
+
+The following steps will guide you through the process of committing a change on GitHub. A commit records changes in renaming, changing content within, creating a new file, and any other changes made to your project. For this exercise, committing a change requires first adding a new file to your new branch.
+
+1. On the **< > Code** tab in the header menu of your repository, make sure you're on your new branch `my-first-branch`.
+
+2. Select the **Add file** drop-down and click **Create new file**.
+
+   ![create new file option](/images/create-new-file.png)
+
+3. In the **Name your file...** field, enter `PROFILE.md`.
+
+   **Note:** `.md` is a file extension that creates a Markdown file. You can learn more about Markdown by visiting "[Basic writing and formatting syntax](https://docs.github.com/en/get-started/writing-on-github/getting-started-with-writing-and-formatting-on-github/basic-writing-and-formatting-syntax)" in our docs or by taking the "[Communicating using Markdown](https://github.com/skills/communicate-using-markdown)" Skills course.
+
+4. In the **Edit new file** area, copy the following content to your file:
+
+   ```
+   Welcome to my GitHub profile!
+   ```
+
+   <img alt="profile.md file screenshot" src="/images/my-profile-file.png"/>
+
+5. For commits, you can enter a short commit message that describes what changes you made. This message helps others know what's included in your commit. GitHub offers a simple default message, but let's change it slightly for practice. First, enter `Add PROFILE.md` in the first text-entry field below **Commit new file** at the bottom of the page. Then, if you want to confirm what your screen should look like, expand the dropdown below.
+
+   <img alt="screenshot of adding a new file with a commit message" src="/images/commit-full-screen.png" />
+
+6. In this lesson, we'll ignore the other fields and click **Commit new file**.
+7. Wait about 20 seconds then refresh this page (the one you're following instructions from). [GitHub Actions](https://docs.github.com/en/actions) will automatically update to the next step.

.github/steps/3-open-a-pull-request.md

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+<!--
+  <<< Author notes: Step 3 >>>
+  Just a historic note: the previous version of this step forced the learner
+  to write a pull request description,
+  checked that `main` was the receiving branch,
+  and that the file was named correctly.
+-->
+
+## Step 3: Open a pull request
+
+_Nice work making that commit! :sparkles:_
+
+Now that you have made a change to the project and created a commit, it’s time to share your proposed change through a pull request!
+
+**What is a pull request?**: Collaboration happens on a _[pull request](https://docs.github.com/en/get-started/quickstart/github-glossary#pull-request)_. The pull request shows the changes in your branch to other people and allows people to accept, reject, or suggest additional changes to your branch. In a side by side comparison, this pull request is going to keep the changes you just made on your branch and propose applying them to the `main` project branch. For more information about pull requests, see "[About pull requests](https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/about-pull-requests)".
+
+### :keyboard: Activity: Create a pull request
+
+You may have noticed after your commit that a message displayed indicating your recent push to your branch and providing a button that says **Compare & pull request**.
+
+![screenshot of message and button](/images/compare-and-pull-request.png)
+
+To create a pull request automatically, click **Compare & pull request**, and then skip to step 6 below. If you don't click the button, the instructions below walk you through manually setting up the pull request.
+
+1. Click on the **Pull requests** tab in the header menu of your repository.
+2. Click **New pull request**.
+3. In the **base:** dropdown, make sure **main** is selected.
+4. Select the **compare:** dropdown, and click `my-first-branch`.
+
+   <img alt="screenshot showing both branch selections" src="/images/pull-request-branches.png" />
+
+5. Click **Create pull request**.
+6. Enter a title for your pull request. By default, the title will automatically be the name of your branch. For this exercise, let's edit the field to say `Add my first file`.
+7. The next field helps you provide a description of the changes you made. Here, you can add a description of what you’ve accomplished so far. As a reminder, you have: created a new branch, created a file, and made a commit.
+
+   <img alt="screenshot showing pull request" src="/images/Pull-request-description.png" />
+
+8. Click **Create pull request**. You will automatically be navigated to your new pull request.
+9. Wait about 20 seconds then refresh this page (the one you're following instructions from). [GitHub Actions](https://docs.github.com/en/actions) will automatically update to the next step.
+
+   **Note**: As a perk, you may see evidence of GitHub Actions running on the tab with the pull request opened! The image below shows a line you might see on your pull request after the Action finishes running.
+
+   <img alt="screenshot of an example of an actions line" src="/images/Actions-to-step-4.png"/>

.github/steps/4-merge-your-pull-request.md

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+<!--
+  <<< Author notes: Step 4 >>>
+  Just a historic note: The previous version of this step required responding
+  to a pull request review before merging. The previous version also handled
+  if users accidentally closed without merging.
+-->
+
+## Step 4: Merge your pull request
+
+_Nicely done! :sunglasses:_
+
+You successfully created a pull request. You can now merge your pull request.
+
+**What is a merge?**: A _[merge](https://docs.github.com/en/get-started/quickstart/github-glossary#merge)_ adds the changes in your pull request and branch into the `main` branch. For more information about merges, see "[Merging a pull request](https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/incorporating-changes-from-a-pull-request/merging-a-pull-request)."
+
+As noted in the previous step, you may have seen evidence of GitHub Actions running which automatically progresses your instructions to the next step. You'll have to wait for it to finish before you can merge your pull request. It will be ready when the merge pull request button is green.
+
+![screenshot of green merge pull request button](/images/Green-merge-pull-request.png)
+
+### :keyboard: Activity: Merge the pull request
+
+1. Click **Merge pull request**.
+2. Click **Confirm merge**.
+3. Once your branch has been merged, you don't need it anymore. To delete this branch, click **Delete branch**.
+
+   <img alt="screenshot showing delete branch button" src="/images/delete-branch.png"/>
+
+4. Wait about 20 seconds then refresh this page (the one you're following instructions from). [GitHub Actions](https://docs.github.com/en/actions) will automatically update to the next step.
+
+   **Note**: Check out the **Finish** step to see what you can learn next!

.github/steps/X-finish.md

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+<!--
+  <<< Author notes: Finish >>>
+  Review what we learned, ask for feedback, provide next steps.
+-->
+
+## Finish
+
+_Congratulations, you've completed this course and joined the world of developers!_
+
+<img src=https://octodex.github.com/images/collabocats.jpg alt=celebrate width=300 align=right>
+
+Here's a recap of your accomplishments:
+
+- You learned about GitHub, repositories, branches, commits, and pull requests.
+- You created a branch, a commit, and a pull request.
+- You merged a pull request.
+- You made your first contribution! :tada:
+
+### What's next?
+
+If you'd like to make a profile README, use the quickstart instructions below or follow the instructions in the [Managing your profile README](https://docs.github.com/account-and-profile/setting-up-and-managing-your-github-profile/customizing-your-profile/managing-your-profile-readme) article.
+
+1. Make a new public repository with a name that matches your GitHub username.
+2. Create a file named `README.md` in its root. The "root" means not inside any folder in your repository.
+3. Edit the contents of the `README.md` file.
+4. If you created a new branch for your file, open and merge a pull request on your branch.
+5. Lastly, we'd love to hear what you thought of this course [in our discussion board](https://github.com/skills/.github/discussions).
+
+Check out these resources to learn more or get involved:
+
+- Are you a student? Check out the [Student Developer Pack](https://education.github.com/pack).
+- [Take another GitHub Skills course](https://github.com/skills).
+- [Read the GitHub Getting Started docs](https://docs.github.com/en/get-started).
+- To find projects to contribute to, check out [GitHub Explore](https://github.com/explore).

.github/workflows/0-welcome.yml

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+name: Step 0, Welcome
+
+# This step triggers after the learner creates a new repository from the template.
+# This workflow updates from step 0 to step 1.
+
+# This will run every time we create push a commit to `main`.
+# Reference: https://docs.github.com/en/actions/learn-github-actions/events-that-trigger-workflows
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - main
+
+# Reference: https://docs.github.com/en/actions/security-guides/automatic-token-authentication
+permissions:
+  # Need `contents: read` to checkout the repository.
+  # Need `contents: write` to update the step metadata.
+  contents: write
+
+jobs:
+  # Get the current step to only run the main job when the learner is on the same step.
+  get_current_step:
+    name: Check current step number
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - id: get_step
+        run: |
+          echo "current_step=$(cat ./.github/steps/-step.txt)" >> $GITHUB_OUTPUT
+    outputs:
+      current_step: ${{ steps.get_step.outputs.current_step }}
+
+  on_welcome:
+    name: On welcome
+    needs: get_current_step
+
+    # We will only run this action when:
+    # 1. This repository isn't the template repository.
+    # 2. The step is currently 0.
+    # Reference: https://docs.github.com/en/actions/learn-github-actions/contexts
+    # Reference: https://docs.github.com/en/actions/learn-github-actions/expressions
+    if: >-
+      ${{ !github.event.repository.is_template
+          && needs.get_current_step.outputs.current_step == 0 }}
+
+    # We'll run Ubuntu for performance instead of Mac or Windows.
+    runs-on: ubuntu-latest
+
+    steps:
+      # We'll need to check out the repository so that we can edit README.md.
+      - name: Checkout
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0 # Let's get all the branches.
+
+      # In README.md, switch step 0 for step 1.
+      - name: Update to step 1
+        uses: skills-dev/action-update-step@main
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          from_step: 0
+          to_step: 1
+          branch_name: my-first-branch