Enhance features

* Add diagramingg features (mermaid)
* Remove the need for some HTML characters
(pymdownx.caret,pymdownx.tilde)
* Add support for highlighting (pymdownx.mark)

Author: sspencerwire

mkdocs.yml

@@ -48,8 +48,15 @@ markdown_extensions:
       emoji_index: !!python/name:materialx.emoji.twemoji
       emoji_generator: !!python/name:materialx.emoji.to_svg
   - pymdownx.highlight
-  - pymdownx.superfences
+  - pymdownx.superfences:
+      custom_fences:
+      - name: mermaid
+        class: mermaid
+        format: !!python/name:pymdownx.superfences.fence_code_format
   - pymdownx.keys
+  - pymdownx.caret
+  - pymdownx.mark
+  - pymdownx.tilde
   - pymdownx.tabbed:
       alternate_style: true
   - pymdownx.details