Update gh-pages.yml

Author: simongravelle

.github/workflows/gh-pages.yml

@@ -44,7 +44,7 @@ jobs:
           cp source/gromacs_replace.html build/html/miscellaneous/use-gromacs-instead.html
       - name: Deploy
         uses: peaceiris/actions-gh-pages@v3
-        if: ${{ github.ref == 'refs/heads/2Aug2023' }}
+        if: ${{ github.ref == 'refs/heads/main' }}
         with:
           context: .
           github_token: ${{ secrets.GITHUB_TOKEN }}