mkdocs improvement

.github/workflows/docs.yml

@@ -37,7 +37,7 @@ jobs:
           python-version: '3.x'
 
       - name: Install mkdocs and dependencies
-        run: pip install mkdocs mkdocs-bootswatch
+        run: pip install mkdocs mkdocs-material
 
       - name: Build documentation
         run: mkdocs build --strict