i3wm: add option hide_edge_borders
i3wm: add option hide_edge_borders

remove 1pixel border (blue) guideline layout for next window
(vertical/horizontal) to spawn

note: option 'smart' avaiable from 4.13 (i3 pull 2191)
not available on default i3 (4.11) of ubuntu 16.04
could comment out or use 'both' instead

iiey/dotfiles