Replacing i3wm with bspwm (hacky)

This is completely hacky and merely the first way that I dug-out which could keep most of the regolith/gnome stuff to manage the system, but replace i3 with bspwm.

Of course, dotfiles and config are still required.

Replace this line

https://github.com/regolith-linux/regolith-session/blob/main/usr/bin/regolith-session-init#L21

with

bspwm