add list of mkdocs/material extensions

Author: sujaypatil96

template/mkdocs.yml.jinja

@@ -40,6 +40,11 @@ markdown_extensions:
           # disable code highlighting to display diagrams
           format: !!python/name:pymdownx.superfences.fence_code_format
           class: mermaid
+  - admonition
+  - tables
+  - pymdownx.magiclink
+  - attr_list
+  - md_in_html
 
   # TODO rebuild docs on schema change (https://github.com/linkml/linkml-project-copier/issues/39)
   # - gen-files: