Update documentation.yaml

Author: lee1043

.github/workflows/documentation.yaml

@@ -10,7 +10,7 @@ jobs:
       - uses: actions/setup-python@v3
       - name: Install dependencies
         run: |
-          pip install sphinx sphinx_rtd_theme sphinx_book_theme sphinx_autosummary_accessors sphinx-copybutton sphinx-design
+          pip install sphinx sphinx_rtd_theme sphinx_book_theme sphinx_autosummary_accessors sphinx-copybutton sphinx-design nbsphinx
       - name: Sphinx build
         run: |
           sphinx-build docs _build