dustbowl: make swayidle a systemd service + run nixpkgs-fmt

sway/config

@@ -22,20 +22,6 @@ set $term env XCURSOR_THEME=Adwaita footclient
 # on the original workspace that the command was run on.
 # set $menu dmenu_path | dmenu | xargs swaymsg exec --
 
-### Idle configuration
-#
-# Example configuration:
-#
-exec swayidle -w \
-         timeout 300 'swaylock -f -c 000000' \
-         timeout 600 'swaymsg "output * dpms off"' \
-              resume 'swaymsg "output * dpms on"' \
-         before-sleep 'swaylock -f -c 000000'
-
-# This will lock your screen after 300 seconds of inactivity, then turn off
-# your displays after another 300 seconds, and turn your screens back on when
-# resumed. It will also lock your screen before your computer goes to sleep.
-
 ### Start foot server
 
 exec foot --server