Collapsible headings

[alexlenail]

Collapsible headings now exist on jupyter lab. Would it be possible to add them to fastpages as an option?

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[hamelsmu]

@choldgraf check it out someone trying to marry JupyterBook with fastpages kind of https://alexlenail.me/back_of_my_envelope/2021/06/23/Enzyme-Kinetic-Parameter-Inference.html

[choldgraf]

@hamelsmu super cool 🙂