Add Thunderbird, cut down on swap usage to make hibernation more reliable

modules/desktop/plasma/default.nix

@@ -0,0 +1,16 @@
+{ inports, pkgs, ... }:
+{
+    environment.plasma6.excludePackages = with pkgs.kdePackages; [
+        elisa
+        kwrite
+        kate
+        okular
+    ];
+
+    home-manager.sharedModules = [
+        inputs.plasma-manager.homeModules.plasma-manager
+        ./home
+    ];
+
+    services.desktopManager.plasma6.enable = true;
+}