Add MCP server support for using up to date docs with LLMs

# Feature request

Solve the problem of having outdated dev docs when using LLM's, by enabling an MCP server for devdocs .

https://github.com/modelcontextprotocol/servers

## Summary

Solve the problem of having outdated dev docs when using LLM's, by enabling an MCP server for devdocs. Use something like cognee.a for Hybrid RAG w Knowledge graphs approach.

More about Model Context Protocol:

https://github.com/modelcontextprotocol/servers

## Examples

Image u are using the latest version of LlamaIndex, or any other new/recently updated dev docs, the LLM is at least 1 year behind latest developments.

Pls fix this

该 issue 没有指明文件、测试或入口点。首先查看链接的 Model Context Protocol server examples 和 DevDocs architecture，以确定 MCP server 可以集成到哪里。在实现之前，定义受支持的文档源、检索行为，以及为 LLM 提供最新文档的验收测试。

由索引模型根据 Issue 内容生成。