docs: add MCP Server to getting started page and homepage

[shenxianpeng]

Adds the commit-check-mcp MCP server to the site, covering:

Changes

Getting Started page — Added a 4th grid card for the MCP Server, targeting AI coding agents (Claude Code, Cursor, Copilot, etc.).

Homepage — Updated the "Works Everywhere" card description to include MCP server. Added a new Quick Start tab with an example MCP config snippet.

Why

The commit-check-mcp package is a mature part of the commit-check ecosystem with a dedicated repo and PyPI package. It was missing from the docs despite being listed under the org repos. This makes it discoverable to users looking for AI-agent-friendly commit validation.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: cf2d3813-c61c-411b-9559-15f21e98f7ee

📥 Commits

Reviewing files that changed from the base of the PR and between ea86934 and f3edf6b.

📒 Files selected for processing (2)

• docs/getting-started.md
• docs/index.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/add-mcp-server-to-docs

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