Updated pipeline.

.github/workflows/documentation.yml

@@ -54,7 +54,7 @@ jobs:
       - uses: actions/setup-python@v5
         with:
           python-version: 3.x
-      - run: pip install mkdocs mkdocs-minify-plugin
+      - run: pip install mkdocs mkdocs-material mkdocs-minify-plugin
       - run: |
           cd docs
           mkdocs gh-deploy --force --clean --verbose