Add MCP Toplist rank badge

[chrstphe]

Hi! MCP Toplist tracks 81,919 MCP servers across the major
registries, and Vouch is currently ranked #934.

This PR adds a small live badge to your README showing that rank — it updates
automatically as the leaderboard changes:

Totally fine to close if you'd rather not — and if you'd like your server's
data corrected or removed from the leaderboard, just say so here or open an
issue at the site. Thanks for building Vouch!

Summary by CodeRabbit

• Documentation
  • Added an MCP Toplist badge link to the README’s introductory section.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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Run ID: 246856ad-3614-429d-802e-1e509c076823

📥 Commits

Reviewing files that changed from the base of the PR and between bfac3a4 and 6d0841d.

📒 Files selected for processing (1)

• README.md

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Walkthrough

README.md adds an “MCP Toplist” badge link beside the existing introductory badges. No public declarations or other README content changed.

Changes

README badge update

Layer / File(s)	Summary
Add MCP Toplist badge README.md	The opening badge area now includes an MCP Toplist Markdown badge link.

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

Possibly related PRs

• vouchdev/vouch#408: Adds a badge link to the README header area.
• vouchdev/vouch#419: Adds an MCP-related badge to the README.

Suggested labels: docs, size: XS

Suggested reviewers: plind-junior

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the README change adding an MCP Toplist rank badge.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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Warning

⚠️ This pull request has been flagged as potential spam (promotional) by CodeRabbit slop detection and should be reviewed carefully.