Update gh-pages workflow

Author: Nicoretti

.github/workflows/gh-pages.yml

@@ -18,7 +18,7 @@ jobs:
 
       - name: Build Documentation
         run: |
-          poetry run sphinx-multiversion doc/ .html-documentation 
+          poetry run python -m nox -s docs:multiversion
 
       - name: Deploy
         uses: JamesIves/[email protected]