Origami example binds Tab incorrectly

Hi there,

I've tried integrating with origami as described in 3b5e8faeec1333aca3cafbbaa350dacc95412086, but `use-package` does not like the `:general` symbol in its given position. Actually, it does not seem that `use-package` knows anything about either `:general` or `:keymaps` (I've grepped the source). I've also tried putting `(define-key org-super-agenda-header-map (kbd "TAB") #'origami-toggle-node)` in the `:config` section with no luck. Do you have any other ideas for getting the TAB keybinding to work? Running `M-x origami-toggle-node` on a header works, so the only issue is getting the keybinding to work reliably.