modify doc workflow

Author: dario-coscia

.github/workflows/testing_doc.yml

@@ -13,16 +13,9 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - name: Checkout code
+    - name: Checkout Doc
       uses: actions/checkout@v2
-
-    - name: Set up Python
       uses: ammaraskar/sphinx-action@7.4.7
       with:
         pre-build-command: "python3 -m pip install .[doc]"
-        docs-folder: "docs/"
-
-    - name: Build Sphinx documentation
-      run: |
-        cd docs
-        make html SPHINXOPTS="-W"
+        docs-folder: "docs/"