Adding pyyaml

.github/workflows/jekyll-gh-pages.yml

@@ -13,7 +13,7 @@ jobs:
       - uses: actions/setup-python@v3
       - name: Install dependencies
         run: |
-          pip install sphinx sphinx_rtd_theme owlready2 importlib-resources prefect
+          pip install sphinx sphinx_rtd_theme owlready2 importlib-resources prefect pyyaml
       - name: Sphinx build
         run: |
           sphinx-build -D maxdepth=4 docs docs/_build