Add a tooltip to deprecated apps in the documentation

Author: CLHatch

mkdocs.yml

@@ -48,6 +48,8 @@ extra:
       link: https://dockstarter.com/discord
     - icon: fontawesome/brands/github
       link: https://github.com/GhostWriters/DockSTARTer
+  status:
+    deprecated: This app is deprecated. Use at your own risk.
 
 extra_javascript:
   - https://unpkg.com/[email protected]/dist/tablesort.min.js