Add emoji support for documentation site (#83)

Author: mschoettle

mkdocs.yml

@@ -37,6 +37,10 @@ markdown_extensions:
   - pymdownx.superfences
   - pymdownx.inlinehilite
   - pymdownx.snippets
+  - attr_list
+  - pymdownx.emoji:
+      emoji_index: !!python/name:material.extensions.emoji.twemoji
+      emoji_generator: !!python/name:material.extensions.emoji.to_svg
 
 extra_css:
   - extra.css