[page] create new page for building controls / hotkeys

[wyattlovesgrapes]

Issue

There is no page in the docs explaining what the hotkeys and controls are.

[ileana-pr]

I can pick this up if no one has started on it.

[wyattlovesgrapes]

I can pick this up if no one has started on it.

Please do if you have the time. Docs are currently maintained essentially by myself and @Innkeeping.