Update sphinx_build_deploy.yml

install the readthedocs theme for sphinx

.github/workflows/sphinx_build_deploy.yml

@@ -24,9 +24,9 @@ jobs:
           python -m pip install --upgrade pip
           pip install -r docs/requirements.txt
           
-      - name: Update Sphinx
+      - name: Install ReadTheDocs theme
         run: |
-          pip install -U sphinx
+          pip install sphinx_rtd_theme
 
       - name: Build Sphinx documentation
         run: |