"Update Next.js GitHub Actions workflow to include gh-pages publish branch"

This commit updates the `.github/workflows/nextjs.yml` file for the Next.js GitHub Actions

Author: lrmn7

.github/workflows/nextjs.yml

@@ -51,10 +51,6 @@ jobs:
       - name: Setup Pages
         uses: actions/configure-pages@v2
         with:
-          # Automatically inject basePath in your Next.js configuration file and disable
-          # server-side image optimization (https://nextjs.org/docs/api-reference/next/image#unoptimized).
-          #
-          # You may remove this line if you want to manage the configuration yourself.
           static_site_generator: next
       - name: Restore cache
         uses: actions/cache@v2
@@ -93,3 +89,4 @@ jobs:
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           publish_dir: ./out
+          publish_branch: gh-pages