tree-wide: remove nix-tree

nix/configurations/hydrogen.nix

@@ -41,7 +41,6 @@ in
         overlays = map import [
           ../overlays/agenix.nix
           ../overlays/nur.nix
-          ../overlays/nix-tree.nix
           ../packages/overlay.nix
 
           # use lix everywhere and wrap it with nom

nix/configurations/installer.nix

@@ -38,7 +38,6 @@ in
       ../overlays/agenix.nix
       ../overlays/disko.nix
       ../overlays/nur.nix
-      ../overlays/nix-tree.nix
 
       ../packages/overlay.nix
     ];

nix/configurations/vanadium.nix

@@ -52,7 +52,6 @@ in
           ../overlays/disko.nix
           ../overlays/nur.nix
           ../overlays/wired-notify.nix
-          ../overlays/nix-tree.nix
           ../overlays/wallpapers.nix
           ../overlays/nil.nix
           ../overlays/dix.nix

nix/overlays/nix-tree.nix

@@ -1,8 +0,0 @@
-# The one in nixpkgs doesn't work
-# Getting nix-tree: user error (Failed parsing nix path-info output.)
-let
-  sources = import ../../npins;
-in
-final: _: {
-  nix-tree = (import sources.nix-tree).packages.${final.stdenv.hostPlatform.system}.default;
-}