Add documentation for the accessibility label

[junpataleta]

This patch contains two commits:

• The first commit reorganises the labels and groups them based on category.
• The second commit adds information about using the accessibility label.

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[Copilot]

Pull request overview

This PR reorganizes the tracker labels documentation into logical categories and adds comprehensive documentation for the accessibility label. The changes improve the structure and usability of the documentation by grouping related labels together and providing clear guidance on when to use the accessibility label.

• Labels are now organized into five clear categories: Issue reporting and triaging, Documentation, Integration, QA and testing, and User experience (UX)
• New accessibility label documentation includes WCAG references and clear examples of when to use it

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[jrchamp]

Half of the labels link to the tracker and half do not. Some of the links specify the MDL project and some do not, should this be made consistent?

[junpataleta]

Half of the labels link to the tracker and half do not. Some of the links specify the MDL project and some do not, should this be made consistent?

Hi, @jrchamp. Some labels probably don't need to be displayed as links (e.g., cime), while others should be. However, I think this is a bit out of scope and should be raised and discussed in a follow-up issue.

[mickhawkins]

Thanks for working on this @junpataleta, it's a nice readability improvement and the changes look good to me.