Add a quick display shortcut

[DupuisB]

Hi, I don't know if you are still in charge of this project, and if not, no problem at all.

Would it be possible to add a keyboard shortcut (configurable) to activate/deactivate the overlay in one click? In the idea, maybe just put the transparency at 100% / go back?

I have almost no programming experience, so it would be really cool to create a new release if you take care of it 😅

Wish you a good day!