feat(sddm): init module

hosts/sydpc/configuration.nix

@@ -21,6 +21,7 @@
     stylix.enable = true;
     qemu.enable = true;
     flatpak.enable = true;
+    sddm.enable = true;
 
     steam = {
       enable = true;
@@ -52,20 +53,9 @@
     };
   };
 
-  # services.xserver.desktopManager.plasma5.enable = true;
-
-  # Disable systemd-sleep.  Let KDE or whatever dim the screen without
-  # suspending the computer.
-  # systemd.sleep.extraConfig = ''
-  #   AllowSuspend=no
-  #   AllowHibernation=no
-  #   AllowHybridSleep=no
-  #   AllowSuspendThenHibernate=no
-  # '';
-
   # Make pressing the power button suspend the system.
   services.logind.settings.Login = {
-      HandlePowerKey = "suspend";
+    HandlePowerKey = "suspend";
   };
 
   boot.loader = {
@@ -94,12 +84,6 @@
     };
   };
 
-  services.displayManager.sddm = {
-    enable = true;
-    wayland.enable = true;
-    autoNumlock = true;
-  };
-
   services.libinput = {
     enable = true;
     # Disable mouse acceleration.
@@ -122,8 +106,6 @@
 
   # services.pulseaudio.package = pkgs.pulseaudioFull;
 
-  services.flatpak.enable = true;
-
   # Usually we try to delegate declarations of globally-available packages to
   # separate modules.  These are some exceptional essentials.
   environment.systemPackages = [