feat: move to a flake-parts based flake where templates import flake modules from the root flake

flake.nix

@@ -1,12 +1,27 @@
 {
   description = "A collection of templates for various programming languages";
 
-  outputs = {self}: {
-    templates = {
-      rust = {
-        path = ./rust;
-        description = "A rust flake with crane and templates for command args and configs";
-      };
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+
+    flake-parts.url = "github:hercules-ci/flake-parts";
+
+    treefmt-nix = {
+      url = "github:numtide/treefmt-nix";
+      inputs.nixpkgs.follows = "nixpkgs";
     };
+
+    crane.url = "github:ipetkov/crane";
   };
+
+  outputs = {flake-parts, ...} @ inputs:
+    flake-parts.lib.mkFlake {inherit inputs;} {
+      imports = [
+        ./rust.nix
+      ];
+
+      systems = ["aarch64-linux" "x86_64-linux" "aarch64-darwin" "x86_64-darwin"];
+
+      perSystem = {pkgs, ...}: {formatter = pkgs.alejandra;};
+    };
 }