new github action to deploy docs

.github/workflows/docs.yml

@@ -19,7 +19,6 @@ jobs:
           python -m pip install --upgrade pip
           pip install wheel
           if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
-          pip install .[docs]
       - name: Build docs with Sphinx
         run: sphinx-build docs docs/build
       - name: Deploy to GitHub Pages