Remove navbars

[mwcraig]

I spent a bit of time working on updating the navbar links and table of contents but gave up. The file browser in Jupyter lab essentially takes care of navigation as long as the notebooks or organized (which they are now).

[review-notebook-app[bot]]

Check out this pull request on 

See visual diffs & provide feedback on Jupyter Notebooks.

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[github-actions[bot]]

:point_left: Launch a binder notebook on branch mwcraig/tutorial/gen-toc