Key documentation

[0-wiz-0]

I found https://github.com/aeosynth/bk/blob/8d527788821faee1a2f961d576997351cd68767d/src/view.rs#L80-L103 in the source code, but I didn't find out how to display this help page in bk itself. What is "Fn"? I had tried 'h' and '?', but I see that these do something else. Can you please add mention the key to get help in the bk -h output?

Thank you!

[aeosynth]

function keys, eg f1-f12+

from the readme:

Type any function key (eg F1) to see the keybinds.

i suppose this should be in the help output as well