Restructure to focus on nix.

nixos/flake.nix

@@ -1,41 +0,0 @@
-{
-  inputs = {
-    nixpkgs.url = "github:nixos/nixpkgs/nixos-25.05";
-
-    flake-parts.url = "github:hercules-ci/flake-parts";
-  };
-
-  outputs = inputs @ {self, ...}:
-    inputs.flake-parts.lib.mkFlake {inherit inputs;} (toplevel @ {withSystem, ...}: {
-      systems = ["aarch64-darwin" "aarch64-linux" "x86_64-linux"];
-
-      perSystem = {
-        config,
-        self',
-        inputs',
-        pkgs,
-        system,
-        ...
-      }: {
-        _module.args.pkgs = import inputs.nixpkgs {
-          localSystem = system;
-          config = {
-            allowUnfree = true;
-            allowAliases = true;
-          };
-          overlays = [self.overlays.default];
-        };
-
-        packages = import ./lib/packages.nix pkgs;
-      };
-
-      flake = {
-        lib = import ./lib inputs.nixpkgs withSystem;
-        overlays.default = final: prev: (import ./lib/packages.nix prev);
-
-        nixosModules.default = {...}: {
-          imports = self.lib.utils.findNixFiles ./common;
-        };
-      };
-    });
-}