docs: add MCP Bash Framework to frameworks list

[yaniv-golan]

Summary

Add MCP Bash Framework to the 📚 Frameworks section under "For servers".

MCP Bash Framework enables building MCP servers in pure Bash 3.2+ with:

• Full MCP spec coverage (2025-11-25), including MCP Apps
• No runtimes beyond the shell and jq/gojq
• Tools, resources, prompts, elicitation, roots, progress, cancellation
• Runs on macOS, Linux, and Windows (Git Bash) without Node, Python, or containers

This fills a gap in the frameworks list for shell-native MCP development.

[yaniv-golan]

This PR adds a Framework to the Frameworks section, not a new server listing.

MCP Bash Framework is a development framework that enables building MCP servers in pure Bash - similar to how FastMCP, Foxy Contexts, and Quarkus MCP Server SDK are listed in the same section.

/i-promise-this-is-not-a-new-server

[olaservo]

Thanks for contributing to the MCP servers repo!

We've retired the third-party server list from the README in favor of the MCP Registry — see #3950 for context. The Official Integrations and Community Servers sections no longer exist in the README, so this PR no longer has a target.

Going forward, please publish your server to the MCP Registry using the quickstart guide:
https://github.com/modelcontextprotocol/registry/blob/main/docs/modelcontextprotocol-io/quickstart.mdx

That's where server discovery now happens. Thanks for building on MCP!

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Note: I'm working through the backlog with help from Claude Code to give everyone a prompt response.