ci: Update markdown check workflow to only run on schedule (#1954)

Author: tippmar-nr

.github/workflows/markdowncheck.yml

@@ -1,9 +1,6 @@
 name: Check Markdown links
 
 on: 
-  push:
-    paths:
-      - '**.md' # only run when there are changes to markdown files in a push to any branch
   schedule:
     - cron: "0 9 * * 1-5" # run once a day, M-F
   workflow_dispatch: