fix workflow

.github/workflows/gh_pages_index.yml → .github/workflows/gh_pages_readme.yml

@@ -29,7 +29,7 @@ jobs:
       - name: Commit and push if changed
         run: |
           git config --global user.name 'GitHub Actions'
-          git config --global user.email <>
+          git config --global user.email '<>'
           git add README.md
           git diff-index --quiet HEAD || git commit -m 'Update README.md'
           git push