[plasma] Add module

nixos/modules-old/des/plasma/default.nix

@@ -1,35 +0,0 @@
-{ config, lib, pkgs, ... }:
-
-{
-  services.xserver = {
-    enable = true;
-
-    displayManager = {
-      defaultSession = "plasmawayland";
-      sddm = {
-        enable = true;
-        # https://discourse.nixos.org/t/plasma-wayland-session-not-available-from-sddm/13447/2
-        settings.Wayland.SessionDir = "${pkgs.plasma5Packages.plasma-workspace}/share/wayland-sessions";
-      };
-    };
-    
-    desktopManager.plasma5 = {
-      enable = true;
-      useQtScaling = true;
-    };
-    
-    excludePackages = with pkgs; [
-      xterm
-    ];
-  };
-
-  environment.plasma5.excludePackages = with pkgs.libsForQt5; [
-    elisa
-    okular
-    khelpcenter
-    konsole
-    print-manager
-    plasma-systemmonitor
-    gwenview
-  ];
-}