Merge pull request #17 from PdIPS/TimRoith-patch-1

Update Sphinx.yml

.github/workflows/Sphinx.yml

@@ -11,6 +11,7 @@ jobs:
         run: |
           pip install sphinx sphinx_rtd_theme
           pip install sphinx_design
+          pip install nbsphinx
           pip install pydata-sphinx-theme
           pip install -r requirements.txt
       - name: Sphinx build