fix installation for deploying to GitHub Pages

Author: ks6088ts

.github/workflows/github-pages.yaml

@@ -24,5 +24,5 @@ jobs:
           path: .cache
           restore-keys: |
             mkdocs-material-
-      - run: pip install mkdocs-material
+      - run: make install-deps-docs
       - run: mkdocs gh-deploy --force