🐛 Fix calling mkdocs for languages as a subprocess to fix/enable MkDocs Material search plugin (#5501)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

docs/zh/mkdocs.yml

@@ -32,6 +32,7 @@ repo_name: tiangolo/fastapi
 repo_url: https://github.com/tiangolo/fastapi
 edit_uri: ''
 plugins:
+- search
 - markdownextradata:
     data: data
 nav: