modules/cockpit: remove unnecessary plugins

modules/cockpit/default.nix

@@ -1,3 +1,5 @@
+{ pkgs, ... }:
+
 let
   port = 31350;
 in
@@ -6,6 +8,13 @@ in
   services.cockpit = {
     enable = true;
     inherit port;
+    package = pkgs.cockpit.overrideAttrs {
+      postFixup = ''
+        for package in apps kdump packagekit playground selinux sosreport; do
+          rm -rf $out/share/cockpit/$package
+        done
+      '';
+    };
   };
 
   services.hyprspace.services.manage = "/tcp/${toString port}";