Use user packages for home-manager

flake.nix

@@ -33,6 +33,7 @@
             {
               home-manager = {
                 useGlobalPkgs = true;
+                useUserPackages = true;
                 users.${username} = import ./home.nix;
               };
             }
@@ -72,6 +73,8 @@
               autoOptimiseStore = true;
               extraOptions = ''
                 experimental-features = nix-command flakes
+                keep-derivations = true
+                keep-outputs = true
               '';
               gc.automatic = true;
               package = pkgs.nixUnstable;

home.nix

@@ -38,20 +38,7 @@
     sessionVariables = { EDITOR = "kak"; };
   };
 
-  nix = {
-    package = pkgs.nixUnstable;
-    settings = {
-      experimental-features = "nix-command flakes";
-      keep-derivations = "true";
-      keep-outputs = "true";
-    };
-  };
-
-  nixpkgs.overlays = [
-    (final: prev: {
-      nix-direnv = prev.nix-direnv.override { enableFlakes = true; };
-    })
-  ];
+  nixpkgs.config = builtins.readFile ./nixpkgs-config.nix;
 
   programs.afew = {
     enable = true;