Add custom mermaid fence support to markdown extensions in mkdocs.yml

Author: rebelinux

mkdocs.yml

@@ -83,3 +83,10 @@ theme:
     - navigation.top
     - toc.follow
     - toc.integrate
+
+markdown_extensions:
+  - pymdownx.superfences:
+      custom_fences:
+        - name: mermaid
+          class: mermaid
+          format: !!python/name:pymdownx.superfences.fence_code_format