chore: Update generate_docs workflow to include sphinx-rtd-theme

.github/workflows/generate_docs.yml

@@ -22,6 +22,7 @@ jobs:
           pip install sphinx
           pip install sphinx-autodoc-typehints
           pip install sphinx-pdj-theme
+          pip install sphinx-rtd-theme
           mkdir doc
           sphinx-apidoc -o docs/source/ tol_lab_share tol_lab_share/config tol_lab_share/constants setup_dev_rabbit.py
           make html -C docs