switched modules to flakes

systems/configuration.nix

@@ -1,7 +1,5 @@
-{ pkgs, lib, config, ... }:
-let
-in {
-
+{ pkgs, ... }:
+{
   i18n = {
     defaultLocale = "en_US.utf8";
     supportedLocales = [
@@ -10,7 +8,6 @@ in {
     ];
   };
 
-
   networking.firewall.allowedTCPPorts = [ 22 ];
 
   services = {
@@ -26,13 +23,6 @@ in {
     };
   };
 
-  users.users.brain = {
-    isNormalUser = true;
-    description = "Administrator";
-    extraGroups = [ "networkmanager" "wheel" ];
-    shell = pkgs.zsh;
-  };
-
   nixpkgs.config.allowUnfree = true;
 
   programs = {
@@ -180,7 +170,7 @@ in {
       options = "--delete-oder-than 14d";
     };
 
-    diff-system = true;
+    diffSystem = true;
   };
 
   system = {