refactor: move nixpkgs overlay out of profiles/base and apply to desired hosts

hosts/affogato/default.nix

@@ -11,6 +11,11 @@
     ../../users/leona
   ];
 
+  # add nixpkgs overlay
+  nixpkgs.overlays = [
+    (import ../../pkgs)
+  ];
+
   # Use the systemd-boot EFI boot loader.
   boot.loader.systemd-boot.enable = true;
   boot.loader.efi.canTouchEfiVariables = true;

profiles/base/default.nix

@@ -1,7 +1,4 @@
 { inputs, pkgs, ...}: {
-  nixpkgs.overlays = [
-    (import ../../pkgs)
-  ];
   nixpkgs.config.allowUnfree = true;
   nix.settings.trusted-users = [ "root" "@wheel" ];
   nix.registry.nixpkgs.flake = inputs.nixpkgs;