[v1.x] docs: publish llms.txt and markdown renditions of the docs (#3029)

mkdocs.yml

@@ -1,5 +1,5 @@
-site_name: MCP Server
-site_description: MCP Server
+site_name: MCP Python SDK
+site_description: The official Python SDK for the Model Context Protocol
 strict: true
 
 repo_name: modelcontextprotocol/python-sdk
@@ -85,7 +85,10 @@ markdown_extensions:
   - pymdownx.critic
   - pymdownx.mark
   - pymdownx.superfences
-  - pymdownx.snippets
+  # Resolve snippet includes against the repo root regardless of the build's
+  # working directory (the extension's default base_path is the CWD).
+  - pymdownx.snippets:
+      base_path: !relative $config_dir
   - pymdownx.tilde
   - pymdownx.inlinehilite
   - pymdownx.highlight:
@@ -111,6 +114,9 @@ markdown_extensions:
 watch:
   - src/mcp
 
+hooks:
+  - docs/hooks/llms_txt.py
+
 plugins:
   - search
   - social