chore(ci): fix deploy condition - hopefully

.github/workflows/ci.yml

@@ -35,14 +35,10 @@ jobs:
     needs: build
     name: Deploy to GitHub Pages
     runs-on: ubuntu-latest
-    if: ${{ github.ref == 'refs/heads/source' }}
+    if: github.ref == 'refs/heads/source'
     steps:
       - uses: actions/checkout@v3
       - uses: actions/download-artifact@v3
         with:
           name: build
           path: ./public
-      - uses: peaceiris/actions-gh-pages@v3.9.2
-        with:
-          github_token: ${{ secrets.GITHUB_TOKEN }}
-          publish_dir: ./public