Introduce new About section and restructure the menu

[HLeithner]

User description

Also remove duplicated content from the readme.
Beside active the 53-54 migration entry and some small changes.

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PR Type

Enhancement, Documentation

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Description

• Introduce a new About section with dedicated sidebar and menu entry

  • Adds about folder with documentation and sidebar config
  • Moves About content out of main docs

• Restructure and improve the main navigation menu

  • Adds About and Migrations as top-level items
  • Adjusts API/Framework/Using the CMS menu positions
  • Improves docs version dropdown

• Remove duplicated and outdated content from README

  • README now points contributors to About section

• Activate and update 5.3-5.4 migration documentation

  • Adds migration index and improves compatibility plugin doc

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Changes walkthrough 📝

	Relevant files
Enhancement	2 files docusaurus.config.js Add About docs plugin and restructure navbar/menu                +49/-22  sidebarsAbout.js Add sidebar configuration for About section                            +20/-0
Documentation	9 files README.md Remove duplicated docs, point to About section                      +4/-188  documentation.md Add and expand contributor documentation in About                +65/-21  index.md Add About section landing page (placeholder)                          +6/-0      versioning.md Add documentation versioning guide to About                            [link]    index.md Remove About page from main docs (moved)                                  +0/-10    changes.md Update sidebar position and heading for clarity                    +3/-3      compat-plugin.md Improve compatibility plugin doc and formatting                    +9/-3      index.md Add migration index for 5.3 to 5.4                                              [link]    index.md Rewrite migration docs intro for clarity and accuracy        +11/-13

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PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

⏱️ Estimated effort to review: 3 🔵🔵🔵⚪⚪

🧪 No relevant tests

🔒 No security concerns identified

⚡ Recommended focus areas for review Menu Positioning The PR moves API and Framework links from left to right position, but doesn't update all position attributes consistently. Some menu items have position attributes while others don't have them explicitly defined. { href: 'https://api.joomla.org', label: 'API', position: 'right', }, { href: 'https://framework.joomla.org', label: 'Framework', position: 'right', }, Example Version The versioning example uses 4.3.0 which may be outdated. Consider updating to a more recent version number that matches the current documentation context. npm run docusaurus docs:version 4.3.0 </details> </td></tr> </table>

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PR Code Suggestions ✨

Explore these optional code suggestions:

Category	Suggestion	Impact
General	✅ Fix typo in documentation Suggestion Impact: The commit fixed the typo 'githut' to 'GitHub' as suggested, and also fixed the same typo in other places throughout the document code diff: -forked copy in your githut repository into this git instance. +forked copy in your GitHub repository into this git instance. There's a typo in the word "githut" which should be "GitHub". This typo appears in the documentation about contributing to the project and could confuse new contributors. about/documentation.md [20-21] To install Docusaurus on your own machine you should initialise a local git repository and clone the manual from the -forked copy in your githut repository into this git instance. +forked copy in your GitHub repository into this git instance. [Suggestion has been applied] Suggestion importance[1-10]: 3 __ Why: The suggestion correctly identifies and fixes a typo ('githut' instead of 'GitHub') in the documentation file (about/documentation.md). This improves the clarity and professionalism of the text.	Low
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