organisation + move config for all devices to 'global' counterparts

modules/plasma-desktop.nix

@@ -0,0 +1,30 @@
+{
+  config,
+  pkgs,
+  ...
+}: {
+  services.desktopManager.plasma6 = {
+    enable = true;
+    enableQt5Integration = true;
+  };
+
+  environment.plasma6.excludePackages = with pkgs.kdePackages; [
+    konsole
+    qrca
+  ];
+
+  services.displayManager.defaultSession = "plasma";
+
+  services.displayManager.sddm = {
+    enable = true;
+    theme = "breeze";
+    wayland.enable = true;
+    enableHidpi = true;
+    settings = {
+      Autologin = {
+        Session = "plasma.desktop";
+        User = "grey";
+      };
+    };
+  };
+}