➖ Hide scrollbar in PrimarySidebar

[jnywong]

Ref jupyter-book/mystmd#1672

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Latest commit: 2624fe2

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[agoose77]

Thanks for this PR @jnywong!

I need to do some due diligence to think through what the a11y ramifications of making this change will be. I'll circle back round once I know more!

[jnywong]

Good shout regarding a11y principles! Happy to help with thinking around that.

[jnywong]

Okay yeah, this change is not very a11y-friendly!

Happy to repurpose this into making the scrollbar theme change when switching to dark mode, but need some pointers on where to start because the light/dark mode theme switcher looks a little more complicated to contribute to at first glance.