major rewrite

modules/system/nix/registry.nix

@@ -0,0 +1,22 @@
+{
+  inputs,
+  pkgs,
+  ...
+}: let
+  inherit (inputs) nixpkgs;
+  nixpkgsPath = nixpkgs.outPath;
+in {
+  # Big thanks to Dianimo for this!
+  nix = {
+    registry = {
+      nixpkgs.flake = inputs.nixpkgs;
+      default.flake = inputs.nixpkgs;
+    };
+
+    nixPath = [
+      "nixpkgs=${nixpkgsPath}"
+      "n=${nixpkgsPath}"
+      "default=${nixpkgsPath}"
+    ];
+  };
+}