Create ctrl+k interface for keyboard shortcuts

[cmdcolin]

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Currently, many things in the jbrowse UI requires fair amount of point and click. We could create a system for keyboard shortcuts, and i'm specifically inspired by the "ctrl+k"/"command palette" type demos

Example library here https://www.npmjs.com/package/kbar

this can a) improve accessibility and b) make certain operations faster

there could be interesting applications of this where the ctrl+k acts on the "currently selected thing", so you could list actions on the "currently selected thing"

just an idea :)