*: create TOC and add index for TiDB releases

[lilin90]

What is changed, added or deleted? (Required)

• Moved the detailed release notes navigation from TOC.md to a new TOC-tidb-releases.md file.
• Renamed releases/release-notes.md to releases/_index.md and updated all references to the new path across documentation.

Which TiDB version(s) do your changes apply to? (Required)

Tips for choosing the affected version(s):

By default, CHOOSE MASTER ONLY so your changes will be applied to the next TiDB major or minor releases. If your PR involves a product feature behavior change or a compatibility change, CHOOSE THE AFFECTED RELEASE BRANCH(ES) AND MASTER.

For details, see tips for choosing the affected versions.

• master (the latest development version)
• v9.0 (TiDB 9.0 versions)
• v8.5 (TiDB 8.5 versions)
• v8.1 (TiDB 8.1 versions)
• v7.5 (TiDB 7.5 versions)
• v7.1 (TiDB 7.1 versions)
• v6.5 (TiDB 6.5 versions)
• v6.1 (TiDB 6.1 versions)
• v5.4 (TiDB 5.4 versions)

What is the related PR or file link(s)?

• This PR is translated from:
• Other reference link(s):

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

[gemini-code-assist]

Summary of Changes

Hello @lilin90, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refactors the documentation structure for TiDB release notes. It introduces a dedicated table of contents for releases and renames the main release notes index file to improve organization and consistency across the documentation. This change aims to streamline navigation for users looking for specific release information.

Highlights

• Dedicated Release Notes TOC: A new file, "TOC-tidb-releases.md", has been created to house the comprehensive navigation for all TiDB release notes, separating it from the main "TOC.md".
• Standardized Release Notes Index: The primary release notes file "releases/release-notes.md" has been renamed to "releases/_index.md" to follow a more standardized indexing convention.
• Updated Internal References: All existing documentation files that previously linked to "releases/release-notes.md" have been updated to point to the new "releases/_index.md" path.

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[gemini-code-assist]

Code Review

This pull request refactors the documentation for TiDB releases by moving the detailed release notes navigation to a separate file and updating links accordingly. The changes are well-executed and improve the structure of the documentation. I've provided a few suggestions to further improve clarity and maintainability, such as correcting the placement of some older release versions in the new table of contents file, improving the summary in the main release notes index, and fixing a minor typo for consistency.

[lilin90]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lilin90

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Details

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• OWNERS [lilin90]

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