Feature request: cheatsheet-toggle command

[pataquets]

I'm a happy cheatsheet user and found it very handy. Thanks for sharing @mykyta-shyrin!
I have it bound cheatsheet-show to an F-key for quick access, but when the cheatsheet opens, hitting the same key again opens another cheatsheet buffer. I think that a cheatsheet-toggle function which would open/close as appropriate when invoked would be the icing on the cake.

EDIT: I've found an implementation of this on @andrwj's fork of cheatsheet.