Merge branch 'collapsible-examples' into 'preview'

Add admonition to mkdocs.yml

See merge request zih/hpc-compendium/hpc-compendium!182

doc.zih.tu-dresden.de/mkdocs.yml

@@ -171,6 +171,9 @@ extra_css:
   - stylesheets/extra.css
 
 markdown_extensions:
+    - admonition
+    - pymdownx.details
+    - pymdownx.superfences
     - toc:
         permalink: True
     - attr_list