feat: Add text mode for showing alphanumeric keys as text

[80avin]

Context: I had to demo a vim session but seeing the alphanumeric keys as keycaps is very unintuitive.

This PR adds a text mode, in which, the text is shown as - text, not keycaps.

Also, it changes the default behaviour of / key, which was treated as ? in normal mode and / in shift mode, while in reality it is mostly opposite.

(ignore the low quality video - happened as artifact while converting mp4 to gif)

Since the feature was unasked, feel free to reject the PR.
And if you like the idea, I would request to add a proper "Vim mode" which renders all commands as vim renders shortcuts.

[JereNwa]

As for the "/" thing, there's a feature that you can enable that I think might help.

However, if you're going to add this feature, I recommend having the spaces actually show as spaces instead of having the " ﹈ " character appear.