Add Jotdown MCP server

[Harry-027]

I've added the Jotdown MCP server to the repository. This server gives LLMs the ability to:

• 📝 Create and update Notion pages.
• 📚 Generate mdbook-style documentation with structured chapters.

The server is implemented in Rust (🦀) and is self-hostable (🏠).

Repository link: https://github.com/Harry-027/JotDown