move nix config to flake

flake.nix

@@ -1,6 +1,23 @@
 {
   description = "Veneficium's amazing fantastic mindblowingly stupid nixOS configuration! :3";
 
+  nixConfig = {
+    experimental-features = "nix-command flakes";
+    substitute = "true";
+    extra-substituters = [
+      "https://cache.nixos.org"
+      "https://nix-community.cachix.org"
+      "https://niri.cachix.org"
+    ];
+    trusted-public-keys = [
+      "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY="
+      "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
+      "niri.cachix.org-1:Wv0OmO7PsuocRKzfDoJ3mulSl7Z6oezYhGhR+3W2964="
+    ];
+    cores = 0;
+    max-jobs = 2;
+  };
+
   inputs = {
     nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
 

hosts/main-laptop/configuration.nix

@@ -19,15 +19,6 @@
 
   users.extraGroups.vboxusers.members = [ "fedfer" ];
 
-  nix.settings = {
-    substituters = [
-      "https://nix-community.cachix.org"
-    ];
-    trusted-public-keys = [
-      "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
-    ];
-  };
-
   stylix.enable = true;
   stylix.autoEnable = true;
   stylix = {

scripts/rebuild.sh

@@ -1,2 +1,2 @@
 #! /bin/sh
-sudo nixos-rebuild switch --flake .
+sudo nixos-rebuild switch --accept-flake-config --flake .