* docs: add MCP server configuration guide
Covers the three transport types (HTTP, stdio, Unix), OAuth 2.1
authentication, environment variables for stdio servers, custom
headers, the mcp-servers.json config format, example servers,
and troubleshooting.
Written against the current implementation in src/tools/mcp/ and
src/cli/mcp.rs.
* fix: docs
* chore: better explain toggle
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Co-authored-by: Guille <gagdiez.c@gmail.com>
Co-authored-by: Guillermo Alejandro Gallardo Diez <gagdiez@iR2.local>