Update the custom widget tutorial for JupyterLab 3.0 #3129
Merged
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Follow-up to #2919
Partially addresses #3128.
Update the initial instructions to mention the commands to develop the widget for JupyterLab 3.0.
Preview: https://ipywidgets--3129.org.readthedocs.build/en/3129/examples/Widget%20Custom.html#Build-and-install-the-widget-for-development