feat: add changelog system

[jd]

This implements a new changelog system to the docs so it's easy to
browse it and subscribe via RSS.

Fixes MRGFY-5981

[mergify]

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[mergify]

@jd this pull request is now in conflict 😩

[mergify]

@jd this pull request is now in conflict 😩

[Copilot]

Pull Request Overview

This PR adds a comprehensive changelog feature to the documentation site, allowing users to view and filter product updates directly within the docs.

• Adds a new changelog content collection with schema validation for title, date, description, and tags
• Implements utility functions for sorting, grouping, and formatting changelog entries
• Creates both an index page with filtering/search and individual detail pages for each changelog entry
• Integrates changelog into site navigation and updates internal links from external changelog

Reviewed Changes

Copilot reviewed 15 out of 17 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/util/changelog.ts	Utility functions for sorting, grouping, and formatting changelog entries
src/pages/changelog/index.astro	Main changelog page with search, filtering, and RSS subscription
src/pages/changelog/[slug].astro	Individual changelog entry detail page
src/pages/changelog/rss.xml.ts	RSS feed endpoint for changelog entries
src/content.config.ts	Adds changelog collection schema with validation
src/components/Breadcrumbs.astro	Adds breadcrumb support for changelog pages
src/layouts/MainLayout.astro	Makes headings optional and adds breadcrumbTitle prop
src/components/Header/Header.astro	Updates changelog link to internal page
src/components/Footer/footer.ts	Updates footer changelog link to internal page
src/components/Button.astro	Adds target prop with default '_blank'
src/components/Header/HeaderLink.astro	Adds target prop support
src/content/navItems.tsx	Adds changelog to navigation items
src/styles/index.css	Adds no-counter class to exclude elements from auto-numbering
package.json	Adds @astrojs/rss dependency
eslint.config.js	Excludes changelog content from linting

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[jd]

This pull request is part of a stack:

1. feat: add changelog system (#9134) 👈

[mergify]

@jd this pull request is now in conflict 😩

[mergify]

Queue status

✅ The pull request has been merged

This pull request spent 1 minute 39 seconds in the queue, including 1 minute 26 seconds waiting for CI.
The checks were run on draft #9296.

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    • feat: add changelog system #9134
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      • feat: add changelog system #9134
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      • feat: add changelog system #9134
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      • feat: add changelog system #9134
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    • feat: add changelog system #9134
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    • feat: add changelog system #9134
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        • feat: add changelog system #9134