Update Sync Master To GH-Pages.yaml

Modified it so it can be run manually.

Author: dparvin

.github/workflows/Sync Master To GH-Pages.yaml

@@ -4,6 +4,9 @@ on:
     branches:
       - master
 
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
 jobs:
   sync:
     runs-on: ubuntu-latest