#16 Merge pull request from a-lab-nagoya/astropenguin/issue15

Fix workflow for GitHub Pages

Author: astropenguin

.github/workflows/gh-pages.yaml

@@ -19,7 +19,6 @@ jobs:
       - name: Publish HTML slides
         uses: peaceiris/actions-gh-pages@v3
         with:
-          destination_dir: "${GITHUB_REF_NAME}"
           github_token: ${{ secrets.GITHUB_TOKEN }}
           publish_branch: gh-pages
           publish_dir: build