ENH: enable more keyboard shortcuts, like filtering with `ctrl + f` for example

[corneliusroemer]

As a heavy keyboard user I'd love Auspice to support more power-user features like keyboard-only filtering.

Right now, ctrl+f just triggers the normal browser find function. I think it would make sense to use it for focussing on Filter Data to allow filtering of data just with the keyboard.

In general, one could think more about keyboard based navigation. Like zoom out, zoom to selected, navigate back up the zoom stack etc could all be key triggered. Then I wouldn't need to hit the very tiny (though incredibly useful) - lens with my mouse.