Provide a way to disable rustdoc keyboard shortcuts

[Manishearth]

Some people have custom OS or browser-level shortcuts, providing a way to disable these makes it easier for them

[GuillaumeGomez]

I can add a setting for it if you want. But do we want to disable all keyboard shortcuts or only a few of them? For example, I doubt that 'S' is conflicting in any layout (but I might be wrong!).

[Manishearth]

This isn't about layouts, this is about custom shortcuts. So yes, disable all of them.

[GuillaumeGomez]

But then some features won't be accessible anymore (well, I doubt that the '?' menu would interest people who don't care about provided shortcuts). Also, should we keep the text of the search bar as is even though the shortcuts are disabled?

[Mark-Simulacrum]

I think not referring to the shortcuts when they are disabled makes sense; a single button is sufficient IMO as Manish said. If features aren't available without the shortcut, that seems a bit weird, but I'd need a list of such features since I can't think of any other than ? which is obviously useless if shortcuts are off.

Gmail, for example, provides a single button (https://support.google.com/mail/answer/6594?hl=en).

[GuillaumeGomez]

Well then, I'll add the option and not change anything else then.