Add standard pkg dependencies to docs build

.github/workflows/docs.yml

@@ -9,6 +9,8 @@ jobs:
             - uses: actions/checkout@v3
             - uses: actions/setup-python@v3
             - name: "Install dependencies"
+              run: pip install -r requirements.txt
+            - name: "Install sphinx"
               run: pip install -r requirements.docs.txt
             - name: "Sphinx link check"
               run: sphinx-build docs -W -b linkcheck -d docs/_build/doctrees docs/_build/html