Update GitHub pages workflow to include contents: write

The peaceiris/actions-gh-pages GitHub action requires
"contents:write" permission.

.github/workflows/gh-pages.yml

@@ -1,15 +1,15 @@
 name: "GitHub Pages"
 
 on:
-  push:
-    branches:
-      - main
+  push
+  #  branches:
+  #    - main
 
 jobs:
   deploy:
     runs-on: ubuntu-latest
     permissions:
-      contents: read
+      contents: write # Required for deploying pages
       pages: write # Required for deploying pages
     steps:
       - uses: actions/checkout@v2