system: remove nix import from core to system/default.nix

system/core/default.nix

@@ -4,7 +4,6 @@
     ./users.nix
     ./security.nix
     ./networking.nix
-    ../nix
   ];
   i18n = {
     defaultLocale = "en_US.UTF-8";

system/default.nix

@@ -1,6 +1,7 @@
 {
   imports = [
     ./core
+    ./nix
 
     ./hardware/printing.nix
     ./hardware/fwupd.nix

system/nix/nixpkgs.nix

@@ -1,18 +1,12 @@
 _: {
   nixpkgs = {
-    overlays = [
-      (_: prev: {
-        lib =
-          prev.lib
-          // import ../../lib {
-            inherit (prev) lib pkgs;
-          };
-      })
-    ];
-
     config = {
       allowUnfree = true;
-      permittedInsecurePackages = ["cinny-4.2.2" "cinny-unwrapped-4.2.2" "segger-jlink-qt4-796s" "openssl-1.1.1w"];
+      permittedInsecurePackages = [
+        "cinny-4.2.2"
+        "cinny-unwrapped-4.2.2"
+        "segger-jlink-qt4-796s"
+      ];
       segger-jlink.acceptLicense = true;
     };
   };