Fix: deploy from main branch on push

Author: lwasser

.github/workflows/gh-pages.yml

@@ -9,7 +9,7 @@ name: Deploy Jekyll site to Pages
 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: