Widget and jl

[marimeireles]

Hey! So I fixed the nav bars we had. Added a notebook to help guide the talk on Jupyter Lite. Fixed the main notebook that serves as an index for the widgets.

[review-notebook-app[bot]]

Check out this pull request on 

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[github-actions[bot]]

:point_left: Launch a binder notebook on branch marimeireles/tutorial/widget-and-jl

[mwcraig]

Thanks, this looks great!