"Find Next" shortcut

[void285]

Hi,
It seems AlephNote have no "find next" or focus to next/previous match shortcut, I think it's usefull, especially with long text.
Could you please consider adding this function, thank you!

[Mikescher]

Okay, I'll add it onto my TODO list. But be warned: currently I don't have that much free time :(

(If you want to send a PR, this would probably a relatively easy fix)

btw sorry I didn't respond earlier - it seems github stopped sending me emails when issues are created?