Remove flake parts

templates/php/common/flake.nix.twig

@@ -1,25 +1,19 @@
 # {{ managedText|raw }}
-
 {
-  inputs = {
-    devshell.url = "github:numtide/devshell";
-    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
-  };
+  description = "A Nix Flake for {{ name }}";
 
-  outputs = inputs@{ flake-parts, ... }:
-    flake-parts.lib.mkFlake { inherit inputs; } {
-      imports = [ inputs.devshell.flakeModule ];
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
 
-      systems = [ "x86_64-linux" ];
+  outputs = { nixpkgs, ... }:
+    let
+      system = "x86_64-linux";
+      pkgs = nixpkgs.legacyPackages.${system};
 
-      perSystem = { config, self', inputs', pkgs, system, ... }: {
-        devshells.default = {
-          packages = with pkgs; [
-{% for package in flake.devshell.packages %}
-            "{{ package }}"
-{% endfor %}
-          ];
-        };
-      };
+      inherit (pkgs) mkShell;
+    in {
+      devShells.${system}.default =
+        mkShell { buildInputs = with pkgs; [ {{ flake.devshell.packages|join(' ') }} ]; };
+
+      formatter.${system} = pkgs.nixfmt;
     };
 }