flake.nix: refactoring using flake-parts

flake-modules/dev.nix

@@ -0,0 +1,29 @@
+{inputs, ...}: {
+  imports = [
+    inputs.pre-commit-hooks.flakeModule
+  ];
+
+  perSystem = {
+    pkgs,
+    config,
+    ...
+  }: {
+    devShells.default = pkgs.mkShellNoCC {
+      shellHook = config.pre-commit.installationScript;
+    };
+
+    formatter = pkgs.alejandra;
+
+    pre-commit = {
+      settings.hooks = {
+        alejandra.enable = true;
+        statix = {
+          enable = true;
+          excludes = [
+            "plugins/lsp/language-servers/rust-analyzer-config.nix"
+          ];
+        };
+      };
+    };
+  };
+}