feat(dotfiles): remove nick mode from theme
feat(dotfiles): remove nick mode from theme

Doesn't seem super useful to have this here. A nick mode can be, as far
as I can tell, "@" (ops), "+" (voices), or " " (everybody else).

So that means that most messages look like this:

    < greghurrell> hi

when they could look like:

    <greghurrell> hi

wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent