Format nix files using new formatter

flake.nix

@@ -2,8 +2,7 @@
   description = "System configuration for panacea";
 
   nixConfig = {
-    extra-substituters =
-      "https://cachix.cachix.org https://nix-community.cachix.org";
+    extra-substituters = "https://cachix.cachix.org https://nix-community.cachix.org";
     extra-trusted-public-keys = ''
       cachix.cachix.org-1:eWNHQldwUO7G2VkjpnjDbWwy4KQ/HNxht7H4SSoMckM=
             nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs='';
@@ -34,7 +33,8 @@
     };
   };
 
-  outputs = { self, nixpkgs, ... }@inputs:
+  outputs =
+    { self, nixpkgs, ... }@inputs:
     let
       system = "x86_64-linux";
 
@@ -43,16 +43,22 @@
         config.allowUnfree = true;
         overlays = [
           (final: prev: {
-            emacs-vterm =
-              ((pkgs.emacsPackagesFor pkgs.emacs29-pgtk).emacsWithPackages
-                (epkgs: with epkgs; [ vterm mu4e ]));
+            emacs-vterm = (
+              (pkgs.emacsPackagesFor pkgs.emacs29-pgtk).emacsWithPackages (
+                epkgs: with epkgs; [
+                  vterm
+                  mu4e
+                ]
+              )
+            );
           })
         ];
       };
 
       lib = nixpkgs.lib;
 
-    in {
+    in
+    {
       nixosConfigurations.panacea = lib.nixosSystem {
         inherit system;
         modules = [