Suggestion: Add shortcuts?

[Kwuang Tang]

Might be useful to add shortcuts for clone/delete/reset focused note :)

[Linus Lee]

Hm, yeah. that'd be handy. I think this is just a matter of:

• Adding an onkeydown in this <textarea/> to handle those keyboard shortcuts when they happen, and call the respective code to do what the buttons currently do.
• We'd also need to pull out those button actions into their separate methods so we can call them from the buttons as well as the shortcuts.

Shouldn't take too long. I'll come back to it unless you / someone else wants to take a stab at it!