Add missing doc from main repository (#4)

Copy from https://github.com/go-gitea/gitea/pull/31211/files
Author: @MaxWipfli

Add missing documentation for https://github.com/go-gitea/gitea/pull/30268

Reviewed-on: https://gitea.com/gitea/docs/pulls/4

.gitea/workflows/build-and-publish.yaml

@@ -5,8 +5,6 @@ on:
   push:
     branches:
       - main
-  schedule:
-    - cron:  '0 */6 * * *' # every six hours on the hour
 
 jobs:
   build-docs: