chore(dotfiles): apply initial i3 tweaks
chore(dotfiles): apply initial i3 tweaks

"smart_gaps" makes gaps appear only when more than one container is
visible. The others are self-explanatory.

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