Update jekyll.yml on push branches main

Author: norbertwg

.github/workflows/jekyll.yml

@@ -4,7 +4,8 @@ name: Deploy Jekyll with GitHub Pages dependencies preinstalled
 on:
   # Runs on pushes targeting the default branch
   push:
-    branches: [$default-branch]
+    branches:
+    - main
 
   # Allows you to run this workflow manually from the Actions tab
   workflow_dispatch: