refactor into modules

home-manager/modules/overlays.nix

@@ -0,0 +1,18 @@
+{ pkgs, inputs, ... }:
+
+let
+  system = pkgs.stdenv.hostPlatform.system;
+  pinnedPkgs = inputs.nixpkgs-pre-ad01.legacyPackages.${system};
+in {
+  nixpkgs.config.allowUnfree = true;
+
+  nixpkgs.overlays = [
+    inputs.rust-overlay.overlays.default
+    (final: prev: {
+      gqrx = pinnedPkgs.gqrx;
+      krita = pinnedPkgs.krita;
+    })
+  ];
+
+  home.packages = [ pkgs.rustup ];
+}