fix bug no kernel found

.github/workflows/docs.yaml

@@ -17,7 +17,9 @@ jobs:
         fetch-depth: 0 # otherwise, you will failed to push refs to dest repo
     - name: install dacapo
       # run: pip install .[docs]
-      run: pip install sphinx-autodoc-typehints sphinx-autoapi sphinx-click sphinx-rtd-theme myst-parser jupytext ipykernel nbsphinx
+      run: |
+        pip install sphinx-autodoc-typehints sphinx-autoapi sphinx-click sphinx-rtd-theme myst-parser jupytext ipykernel nbsphinx
+        python -m ipykernel install --user --name python3
     - name: parse notebooks
       run: jupytext --to notebook --execute ./docs/source/notebooks/*.py
     - name: remove notebook scripts