Switch from lightdm to ly

nix/hosts/t490/programs.nix

@@ -1,8 +1,6 @@
 { pkgs, ... }:
 
 {
-  programs.dconf.enable = true;
-
   programs.gnupg.agent = {
     enable = true;
     enableSSHSupport = true;

nix/modules/nixos/i3.nix

@@ -20,13 +20,11 @@ in
 
   config = mkIf config.features.desktop.i3.enable {
     services = {
-      displayManager.defaultSession = "none+i3";
+      displayManager.ly.enable = true;
 
-      xserver = {
-        displayManager.lightdm.enable = true;
-
-        windowManager.i3 = {
+      xserver.windowManager.i3 = {
         enable = true;
+
         extraPackages = with pkgs; [
           i3status
           i3lock
@@ -34,12 +32,6 @@ in
         ];
       };
     };
-    };
-
-    environment.systemPackages = with pkgs; [
-      acpi
-      libnotify
-    ];
 
     home-manager.users.${username} = {
       xsession.windowManager.i3 = {