Show creation date alongside last updated date on each page

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: christophdb

mkdocs.yml

@@ -57,7 +57,8 @@ plugins:
       separator: '[\s\-,:!=\[\]()"`/]+|\.(?!\d)|&[lg]t;|(?!\b)(?=[A-Z][a-z])'
   - minify:
       minify_html: true
-  - git-revision-date-localized
+  - git-revision-date-localized:
+      enable_creation_date: true
   - git-committers:
       repository: seatable/seatable-developer-docs
       branch: main