cloud: remove the outdated doc about looker studio connection

[qiancai]

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This PR removes /tidb-cloud/dev-guide-bi-looker-studio.md because the steps in it are no longer valid for the current TiDB Cloud console.

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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This pull request aims to enhance the accuracy and relevance of the TiDB Cloud documentation by removing an outdated guide for connecting TiDB Cloud with Looker Studio. The instructions in the removed guide were no longer valid, and its removal ensures that users are presented with correct and up-to-date information, thereby improving the overall user experience and preventing potential confusion.

Highlights

• Documentation Removal: The dev-guide-bi-looker-studio.md document has been entirely removed, as its content detailing connection steps for Looker Studio is no longer valid for the current TiDB Cloud console.
• Table of Contents Updates: Four Table of Contents (TOC) files (TOC-tidb-cloud-essential.md, TOC-tidb-cloud-premium.md, TOC-tidb-cloud-starter.md, TOC-tidb-cloud.md) have been updated to remove the outdated references to the deleted Looker Studio guide.

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[qiancai]

hi @bohnen, please note that we are removing /tidb-cloud/dev-guide-bi-looker-studio.md, as the data import steps described in the document are no longer applicable to the current TiDB Cloud console.

If you’d like to update the document to use a different dataset, please feel free to revise it and open a new PR. Thank you!

[ti-chi-bot]

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[qiancai]

/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: qiancai

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[gemini-code-assist]

Code Review

This pull request effectively removes outdated documentation related to connecting with Looker Studio and updates the corresponding Table of Contents files. This is a necessary cleanup to ensure the documentation remains accurate and relevant. The changes are straightforward and correctly remove the specified sections.