nix: move dev outputs to subflake

nix/dev/flake.nix

@@ -0,0 +1,65 @@
+{
+  description = "Discord bot for Prism Launcher";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
+    flake-parts = {
+      url = "github:hercules-ci/flake-parts";
+      inputs.nixpkgs-lib.follows = "nixpkgs";
+    };
+
+    get-flake.url = "github:ursi/get-flake";
+
+    pre-commit-hooks = {
+      url = "github:cachix/pre-commit-hooks.nix";
+      inputs = {
+        nixpkgs.follows = "nixpkgs";
+        nixpkgs-stable.follows = "nixpkgs";
+        flake-compat.follows = "";
+      };
+    };
+
+    procfile-nix = {
+      url = "github:getchoo/procfile-nix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+
+    rust-overlay = {
+      url = "github:oxalica/rust-overlay";
+      inputs = {
+        nixpkgs.follows = "nixpkgs";
+        flake-utils.follows = "pre-commit-hooks/flake-utils";
+      };
+    };
+
+    treefmt-nix = {
+      url = "github:numtide/treefmt-nix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+  };
+
+  outputs = {flake-parts, ...} @ inputs:
+    flake-parts.lib.mkFlake {inherit inputs;} {
+      debug = true;
+      imports = [
+        ./args.nix
+        ./docker.nix
+        ./pre-commit.nix
+        ./procfiles.nix
+        ./shell.nix
+        ./static.nix
+        ./treefmt.nix
+
+        inputs.pre-commit-hooks.flakeModule
+        inputs.procfile-nix.flakeModule
+        inputs.treefmt-nix.flakeModule
+      ];
+
+      systems = [
+        "x86_64-linux"
+        "aarch64-linux"
+        "x86_64-darwin"
+        "aarch64-darwin"
+      ];
+    };
+}