add rtdb mcp tools to mcp readme

[antholeole]

realtime database is the longest name so unfortunately had to reformat the whole table.

also removed an extraneous file. update_rules is unimplemented

[gemini-code-assist]

Summary of Changes

Hello @antholeole, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the existing documentation by adding details for newly introduced Realtime Database tools. The update ensures that users have comprehensive information about the available functionalities for managing RTDB data and security rules, improving the overall clarity and utility of the toolset documentation.

Highlights

• Documentation Update: The src/mcp/README.md file has been updated to include new entries for Realtime Database (RTDB) management tools.
• New RTDB Tools Listed: Five new tools related to Firebase Realtime Database operations are now documented: database_get_data, database_set_data, database_get_rules, database_set_rules, and database_validate_rules.

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[gemini-code-assist]

Code Review

This pull request adds documentation for new Realtime Database (RTDB) MCP tools to the README.md and improves the formatting of the tools table. The changes are mostly good, but I found a small typo in a tool description and a documented tool that doesn't seem to be implemented. I've added comments with suggestions to address these points.