try the material theme for the documentation

.github/workflows/mkdocs.yml

@@ -17,6 +17,7 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         pip install mkdocs
+        pip install mkdocs-material
     - name: Build doc
       run: |
         git pull

mkdocs.yml

@@ -1 +1,3 @@
 site_name: IXWebSocket
+theme:
+  name: 'material'