Update documentation.yml

no one liner :-(

.github/workflows/documentation.yml

@@ -13,12 +13,8 @@ jobs:
       - uses: actions/setup-python@v3
       - name: Install dependencies
         run: |
-          #conda install sphinx
-          #pip install sphinx renku-sphinx-theme sphinx-rtd-theme
-          #pip install renku-sphinx-theme
-          #pip install --upgrade sphinx-rtd-theme
-          #pip install --upgrade sphinx sphinx-rtd-theme
-          pip install --upgrade sphinx renku-sphinx-theme sphinx-rtd-theme          
+          pip install sphinx renku-sphinx-theme sphinx-rtd-theme          
+          pip install --upgrade sphinx-rtd-theme
       - name: Sphinx build
         run: |
           sphinx-build docs build