toc: keep Lightning web interface for users of early versions

[lilin90]

What is changed, added or deleted? (Required)

Add back Lightning web interface for users of early versions

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)

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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

[lilin90]

/approve

[gemini-code-assist]

Code Review

This pull request updates the table of contents (TOC.md) by adding a link to the Web Interface documentation (/tidb-lightning/tidb-lightning-web-interface.md) under the TiDB Lightning section. There are no review comments, and I have no feedback to provide.

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[ti-chi-bot]

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This pull-request has been approved by: lilin90

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