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Motivation
This adds the markdown-toc library from the author of remarkable to handle TOC generation. It is much more robust than the solution I'd implemented myself. For example it handles correctly markup including links in headings so things like this don't happen: babel/website#1614 and many more edge cases I had not considered.
Have you read the Contributing Guidelines on pull requests?
yes
Test Plan
In the second commit I'm also rendering markdown backticks in the nav headings into html code tags. So this nav from the cli commands page for examlpe will change like this from left(before) to right(after):

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