docs: Update language pages to indicate whether they are native or from an extension (#13827)

This PR updates the language pages in the docs to indicate whether the
support is available natively or provided by an extension.

Release Notes:

- N/A

docs/src/languages/python.md

@@ -1,5 +1,7 @@
 # Python
 
+Python support is available natively in Zed.
+
 - Tree Sitter: [tree-sitter-python](https://github.com/tree-sitter/tree-sitter-python)
 - Language Server: [pyright](https://github.com/microsoft/pyright)