Rename variables to be clear these are colour names, not the actual
colours. Redefine as baseXX to be used in all scheme variables.
Update all uses to remove "with scheme" form and make more explicit.
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
