new nav release-8.1: remove develop guide, releases, and best practices from TOC.md

[qiancai]

First-time contributors' checklist

• I've signed the Contributor License Agreement, which is required for the repository owners to accept my contribution.

What is changed, added or deleted? (Required)

• Removed doc entries for Develop/Best Practices/Release Notes
• Moved TiDB Installation Packages from the Release Notes category to the References category
• Moved files into best-practices/ and develop/ (ddl-introduction.md -> best-practices/, best-practices-on-public-cloud.md -> best-practices/, java-app-best-practices.md -> develop/).
• Updated internal links in multiple docs (faq, performance-tuning-practices, SQL DDL docs, DXF doc, upgrade guide, telemetry) to point to the new paths.

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: new nav release-8.1: remove develop guide, releases, and best practices from TOC.md docs#22400
• 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

[qiancai]

/approve

[ti-chi-bot]

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