Add workflow_dispatch trigger to sync-to-pages

Enables manual triggering of the sync-to-pages GitHub Actions workflow by adding the workflow_dispatch event.

.github/workflows/sync-to-pages.yml

@@ -12,6 +12,7 @@ on:
       - 'LICENSE'
       - '.gitignore'
       - '.github/**'
+  workflow_dispatch:
 
 jobs:
   convert-and-push: