Fix git collaboration lesson

[kbs-code]

What this PR does

Adds steps to lesson that explain forking and setting up SSH keys. Deletes redundant exercises since the previous ones are now steps.

Kind of change

• New lesson
• [X ] Fix to an existing lesson
• Translation
• New output (prompt, skill, agent, MCP server)
• Docs / website / tooling

Checklist

• [ X] Code runs without errors with the listed dependencies
• [X ] No comments in code files (docs explain, code is self-explanatory)
• [ n/a] Built from scratch first, then shown with a framework (for new lessons)
• [X ] Lesson folder matches LESSON_TEMPLATE.md structure
• [ n/a] ROADMAP.md row for the lesson is a markdown link ([Name](phases/...)), not bare text
• [X ] One lesson per commit (atomic per-lesson rule)
• [X ] Tested locally / code output matches what docs/en.md claims

Phase / lesson

/phases/00-setup-and-tooling/02-git-and-collaboration/

Notes for reviewer

[coderabbitai]

Caution

Review failed

Pull request was closed or merged during review

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 62998277-12a3-4b5b-afe8-17db58569680

📥 Commits

Reviewing files that changed from the base of the PR and between 574a5d6 and 2128484.

📒 Files selected for processing (1)

• phases/00-setup-and-tooling/02-git-and-collaboration/docs/en.md

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📝 Walkthrough

Walkthrough

The "Build It" section of phases/00-setup-and-tooling/02-git-and-collaboration/docs/en.md is rewritten from generic git branching examples into a numbered eight-step fork-based collaboration workflow: SSH key setup, forking the course repo, cloning, configuring origin/upstream remotes, creating a progress branch, committing and pushing, and syncing the fork. The useful-commands table and exercises section are also updated.

Changes

Git collaboration workflow lesson rewrite

Layer / File(s)	Summary
SSH key and fork/clone/remote steps phases/00-setup-and-tooling/02-git-and-collaboration/docs/en.md	Adds Step 2 for SSH key configuration (with a GitHub docs link) and Steps 4–5 for git clone of the fork and git remote add for both origin and upstream.
Branch creation, commit workflow, and fork sync phases/00-setup-and-tooling/02-git-and-collaboration/docs/en.md	Replaces previous branching examples with Step 6 (git checkout -b progress branch), Step 7 (git add/commit/push test workflow), and Step 8 (git fetch upstream + merge sequence to keep the fork current).
Useful commands table and exercises update phases/00-setup-and-tooling/02-git-and-collaboration/docs/en.md	Updates the "Other useful commands" table with restore/reset variants and revises the exercises section to prompt readers to explore history with git log --oneline.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change—fixing the git collaboration lesson by adding forking and SSH key setup steps.
Description check	✅ Passed	The description clearly explains what the PR does (adds forking and SSH key steps, removes redundant exercises) and is directly related to the changeset.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[kbs-code]

I see that Noorislam-XD was already working on a similar PR, however I had already starting working on my own PR for this issue, which is why I submitted it anyway.