ci: add mkdocs-click to docs workflow dependencies

Author: NullPointerDepressiveDisorder

.github/workflows/docs.yml

@@ -19,5 +19,5 @@ jobs:
       - uses: actions/setup-python@v6
         with:
           python-version: '3.12'
-      - run: pip install mkdocs-material
+      - run: pip install mkdocs-material mkdocs-click
       - run: mkdocs gh-deploy --force