use of specific _build folder

.github/workflows/docs.yml

@@ -22,7 +22,8 @@ jobs:
     - name: Commit documentation changes
       run: |
         git clone https://github.com/jbuisine/macop.git --branch gh-pages --single-branch gh-pages
-        cp -r docs/* gh-pages/docs
+        mkdir gh-pages/docs/_build
+        cp -r docs/build/html gh-pages/docs/_build
         cd gh-pages
         touch .nojekyll
         git config --local user.email "action@github.com"