docs: replace broken Vaunt board links

[johnfinnerty-nz]

Summary

Replace obsolete Vaunt community board links with the current Vaunt documentation URL.

Validation

Replacement URL returned HTTP 200; git diff --check passed.

Closes #23746

Summary by CodeRabbit

• Documentation
  • Renamed the TiDB documentation subsection to “Add a community board badge.”
  • Updated the badge text and links to direct readers to the open-source community documentation.
  • Updated template guidance to use the documentation page as a fallback destination.
  • Removed the outdated bullet linking directly to the community boards page.

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Advanced

Run ID: df30bcee-f6b4-490b-b81c-3d44d441970c

📥 Commits

Reviewing files that changed from the base of the PR and between 79cd093 and 5662c9a.

📒 Files selected for processing (1)

• .vaunt/add-tidb-docs-dash-badge.md

Included review availability: Your plan provides up to 4 included reviews per hour; 3 remain after this review.

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📝 Walkthrough

Walkthrough

The Vaunt badge instructions now use the Vaunt developer documentation URL. The badge heading and alt text were updated, and the unavailable community-board link was removed.

Changes

Vaunt badge documentation

Layer / File(s)	Summary
Update badge instructions .vaunt/add-tidb-docs-dash-badge.md	The badge heading and alt text were updated. The pingcap and {{github_username}} links now target the Vaunt developer documentation. The community boards bullet was removed, and the documentation URL is described as a fallback.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Severity of issue fixed: Low

Merge Risk: ⚪ Minimal · up to 5662c

The badge instructions now direct users to the current Vaunt documentation instead of unavailable community-board URLs. The change is ready to merge.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description explains the change and validation, but it omits required template information, including affected TiDB versions and contributor or change-scope checkboxes.	Add the required affected TiDB version selection and complete the applicable template sections, including related links, contributor checklist, AI involvement, and change-scope declarations.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the primary change: replacing broken Vaunt board links.
Linked Issues check	✅ Passed	The changes update the broken Vaunt URL identified in issue [#23746] and replace related obsolete community-board links with the current documentation URL.
Out of Scope Changes check	✅ Passed	All changes are limited to Vaunt community-board link updates in the file identified by issue [#23746]. No unrelated changes are present.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…

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✨ Finishing Touches

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