Replace deprecated MkDocs Material extension

Author: adamkudrna

mkdocs.yml

@@ -18,8 +18,8 @@ markdown_extensions:
   - pymdownx.inlinehilite
   - pymdownx.superfences
   - pymdownx.emoji:
-      emoji_index: !!python/name:materialx.emoji.twemoji
-      emoji_generator: !!python/name:materialx.emoji.to_svg
+      emoji_index: !!python/name:material.extensions.emoji.twemoji
+      emoji_generator: !!python/name:material.extensions.emoji.to_svg
   - attr_list
   - md_in_html