Is your feature request related to a problem? Please describe.
I use some kind of vim binding in every browser i use and there are subtle differences between all of them. A help page would be nice, esp as vimari uses some quite un-vim like bindings i could have never figured out without reading the docs (q, w)...

Describe the solution you'd like
A popup with the keybindings when pressing ?. If not possible, at least in the desktop app a readonly list of the bindings would be nice, not everyone is online all the time...

Describe alternatives you've considered
n/a

Additional context
n/a