cloud release-8.5: remove serverless specific docs

[qiancai]

What is changed, added or deleted? (Required)

This PR removes TiDB Cloud Serverless specific docs from TiDB Cloud Documentation at docs.pingcap.com/tidbcloud.

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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)

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Do your changes match any of the following descriptions?

• Delete files
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• Might cause conflicts after applied to another branch

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[gemini-code-assist]

Summary of Changes

Hello @qiancai, 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 undertakes a significant documentation overhaul, primarily by removing content specific to TiDB Cloud Serverless and reorganizing the remaining documentation for better structure and readability. It also integrates new feature documentation and updates system-level configuration guides to align with the latest product versions and best practices.

Highlights

• Documentation Scope Adjustment: This pull request primarily focuses on removing documentation sections and files specific to TiDB Cloud Serverless, streamlining the content for other TiDB offerings and future releases.
• Content Restructuring and Enhancement: Significant reorganization of the Table of Contents for both TiDB Cloud and TiDB Self-Managed documentation has been implemented, introducing new high-level categories and updating existing content for improved clarity and navigation.
• New Feature Documentation Integration: Documentation for several new features, including the Index Advisor, TiKV MVCC In-Memory Engine, Batch Processing, Utility Functions, and Multi-Column Indexes, has been added or updated across various files.
• Version Alignment and Link Maintenance: Numerous internal links have been updated to reflect the release-8.5 branch, ensuring consistency and accuracy. Additionally, the .lycheeignore file has been expanded to manage new external references.
• Administrative and System Configuration Updates: Updates include changes to the OWNERS file for team roles, refined operating system and hardware requirements, and detailed instructions for system configurations like swap, firewall, and SELinux.

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[gemini-code-assist]

Code Review

This PR removes documentation specific to TiDB Cloud Serverless from the TOC. A follow-up PR might be needed to address other documentation files that still reference Serverless-specific features.