[home] Create explicit kubectl role

This allows work machines to enable development, while not including
non-work-related kubectl management stuffs.

home/home-desktop.nix

@@ -16,6 +16,7 @@
     communication.enable = true;
     sync.enable = true;
     kdeconnect.enable = true;
+    kubectl.enable = true;
   };
 
   targets.genericLinux.enable = true;
@@ -30,4 +31,4 @@
     ./modules/plasma-manager
     ./modules/tmux
   ];
-}
+}