update docs Action

Author: jxtngx

.github/docs.yml

@@ -25,6 +25,7 @@ jobs:
           path: .cache
           restore-keys: |
             mkdocs-material-
-      - run: pip install mkdocs-material
+      - run: pip install ".[docs]"
       - run: cp README.md docs/index.md
+      - run: mkdocs build
       - run: mkdocs gh-deploy --force