ENH: add the JupyterLite notebook setup cell (JupyterLite split 4/5) - #14150

ENH: add the JupyterLite notebook setup cell (JupyterLite split 4/5)#14150

natinew77-creator wants to merge 3 commits into

mne-tools:mainmne-tools/mne-python:mainfrom

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