Dynamic *-help Commands

[hendursaga]

The commands grep-help, image-zoom-help, legit-help, commit-help, rebase-help, and possibly more are "static" in the sense that if you define new keybindings for the commands listed, it still shows the default bindings. I liked how, with Nyxt, the tutorial and other help commands were dynamic, which is especially helpful when switching between Emacs, Vim, and CUA modes.