Move to proper systemctl suspend for sleep, update flake

modules/home/wms/niri/default.nix

@@ -5,7 +5,6 @@
     ./hotkeys
     ./inputs
     ./outputs
-    ./programs
     ./rules
     ./theme
   ];

modules/home/wms/niri/programs/default.nix

@@ -1,4 +0,0 @@
-{ pkgs, ... }:
-{
-  imports = [ ./sleep-niri ];
-}

modules/home/wms/niri/programs/sleep-niri/default.nix

@@ -1,10 +0,0 @@
-{ pkgs, config, ... }: 
-{
-  home.packages = with pkgs; [
-    (pkgs.writeScriptBin "sleep-niri" ''
-      swaylock & ${pkgs.swayidle}/bin/swayidle -w \
-        timeout 1 'niri msg action power-off-monitors' \
-        resume 'niri msg action power-on-monitors; pkill -9 swayidle'
-    '')
-  ];
-}