feat: replace perl activation script with rust-based implementation

Signed-off-by: Chinmay D. Pai <chinmaydpai@gmail.com>

modules/nixos/core/nix/default.nix

@@ -77,5 +77,10 @@
         ];
       };
     };
+
+    system.switch = {
+      enable = false;
+      enableNg = true;
+    };
   };
 }