book deploy attempt 2

.github/workflows/book-deploy.yml

@@ -32,7 +32,6 @@ jobs:
         # Delete the ref to avoid keeping history.
         git update-ref -d refs/heads/gh-pages
         rm -rf ${{ github.ref_name }}
-        mkdir ${{ github.ref_name }}
         mv ../book ${{ github.ref_name }}
         git add .
         git commit -m "Deploy $GITHUB_SHA to gh-pages"