*: move Developer docs to an independent doc set

[qiancai]

What is changed, added or deleted? (Required)

Moved the developer guide and related content from the main and TiDB Cloud TOCs into a new TOC-develop.md file. Updated references and file locations for Looker Studio, WordPress, and Amazon Bedrock integration guides to reflect the new structure. This change centralizes developer resources and streamlines navigation.

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)?

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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 @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 significantly reorganizes the documentation structure by creating a dedicated table of contents for all developer-focused content. This change aims to enhance the discoverability and accessibility of developer guides and related materials, providing a more coherent and user-friendly experience for developers interacting with TiDB and TiDB Cloud.

Highlights

• Documentation Restructuring: The developer documentation has been moved from the main and TiDB Cloud Table of Contents (TOCs) into a new, independent TOC-develop.md file, centralizing all developer-related resources.
• TOC Consolidation: Developer sections have been removed from TOC.md, TOC-tidb-cloud.md, TOC-tidb-cloud-essential.md, and TOC-tidb-cloud-starter.md to streamline navigation and avoid duplication.
• Path Updates and Clarifications: Integration guides for Looker Studio, WordPress, and Amazon Bedrock have been renamed and their file paths updated to reflect the new documentation structure. Specific notes have been added to the Looker Studio and Amazon Bedrock guides to clarify their applicability to TiDB Cloud only.

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[gemini-code-assist]

Code Review

This pull request effectively reorganizes the developer documentation by creating a new, independent doc set. The changes centralize developer resources and improve navigation. My review includes a couple of suggestions to enhance clarity and consistency.

[qiancai]

TBD

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
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[qiancai]

Merge this PR for preview only. Formal review will be conducted in another PR.