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;
-}

npins/sources.json

@@ -148,22 +148,6 @@
       "url": "https://github.com/oxalica/nil/archive/504599f7e555a249d6754698473124018b80d121.tar.gz",
       "hash": "1mzx60999jciq2ax1l5ajmks6fb3cmjavn7fsyh4aysvcdgzrj6p"
     },
-    "nix-tree": {
-      "type": "GitRelease",
-      "repository": {
-        "type": "GitHub",
-        "owner": "utdemir",
-        "repo": "nix-tree"
-      },
-      "pre_releases": false,
-      "version_upper_bound": null,
-      "release_prefix": null,
-      "submodules": false,
-      "version": "v0.8.0",
-      "revision": "e7ef6623cf944b80e48196d74c6531dd79943652",
-      "url": "https://api.github.com/repos/utdemir/nix-tree/tarball/v0.8.0",
-      "hash": "1ag68xnszianrfinm56mf9bhvm0pglvnmlyffjr1pxrkji8d52nc"
-    },
     "nixos-hardware": {
       "type": "Git",
       "repository": {