Add kanshi config to Northstar
Standardise monitor config across machines
Move waybar alt bar definition to Vanguard config specifically, don't
need to use hacky solution
Move sway to desktop/sway and move other packages under programs/sway
up a level to programs/desktop, add niri config to desktop/niri and
refactor common desktop imports into desktop/default.nix that also
imports (for now at least) sway and niri modules
Move wallpapers into programs/desktop since that's where they're
needed anyway
Add helper script to call swaybg with arguments
Evie Litherland-Smith