Fix mkdocs command not found in CI

Author: bogdanminko

.github/workflows/deploy-docs.yml

@@ -38,10 +38,10 @@ jobs:
 
       - name: Install dependencies
         run: |
-          uv pip install --system -e ".[docs]"
+          uv sync --extra docs
 
       - name: Build documentation
-        run: mkdocs build --strict
+        run: uv run mkdocs build --strict
 
       - name: Upload artifact
         uses: actions/upload-pages-artifact@v3