Add index.html to GitHub Pages site

[Copilot]

Navigating to https://argoproj-labs.github.io/gitops-promoter-helm/ currently returns a 404 since no root page exists.

Changes

• docs/index.html: Simple landing page with links to the GitOps Promoter project and this helm chart repository. Includes SEO metadata (description, keywords, author, Open Graph tags, and a canonical link) to improve discoverability by search engines and social sharing previews.
• release-chart.yaml: Extended the git checkout origin/main command to also pull docs/index.html into gh-pages on each release, ensuring the page is deployed alongside chart artifacts.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Add index.html to repo</issue_title>
<issue_description>If you navigate a browser to the repo url, currently you'll get a 404.

Add a simple index.html with a link to this git repo.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Add index.html to repo #40

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[crenshaw-dev]

@copilot add some SEO metadata if you think that would be helpful for crawlers.

[Copilot]

@copilot add some SEO metadata if you think that would be helpful for crawlers.

Added SEO metadata in 677a1f6:

• description and keywords meta tags for search engines
• author meta tag
• Open Graph tags (og:title, og:description, og:url, og:type) for social sharing previews
• canonical link element

[Copilot]

Pull request overview

Adds a root landing page for the GitHub Pages site so the repository URL no longer returns a 404, and ensures it is deployed during chart releases.

Changes:

• Added docs/index.html as a simple landing page with basic SEO + Open Graph metadata.
• Updated the release workflow to checkout docs/index.html onto gh-pages during releases so it gets published alongside chart artifacts.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
docs/index.html	Introduces a minimal GitHub Pages landing page at the published docs/ root.
.github/workflows/release-chart.yaml	Ensures docs/index.html is brought into gh-pages on release so Pages serves it.

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