Remove unnecessary nixpkgs configuration

We're using home-manager.useGlobalPkgs now

users/erwin/home.nix

@@ -1,4 +1,4 @@
-{ pkgs, config, lib, inputs, self-overlay, ... }:
+{ pkgs, config, lib, inputs, ... }:
 with lib; let
   cfg = config.eboskma.users.erwin;
   bt = config.eboskma.bluetooth;
@@ -20,8 +20,6 @@ in
           EDITOR = "${config.home-manager.users.erwin.eboskma.programs.emacs.package}/bin/emacsclient -c";
         };
 
-        nixpkgs.config.allowUnfree = true;
-
         home.stateVersion = "21.11";
 
         eboskma = {
@@ -130,6 +128,7 @@ in
 
         home.packages = with pkgs;
           [
+            ardour
             atool
             bitwarden
             blink1-tool
@@ -244,14 +243,6 @@ in
         };
 
         imports = [
-          {
-            nixpkgs.overlays = [
-              self-overlay
-              inputs.ha-now-playing.overlays.${pkgs.system}
-              inputs.pamedia.overlays.${pkgs.system}
-              inputs.emacs-overlay.overlay
-            ];
-          }
           ../../modules/options
         ] ++ (map (mod: (../../home-manager/modules + "/${mod}")) (builtins.attrNames (builtins.readDir ../../home-manager/modules)));
       };