feat(home): Temporary - install Nix tools

Will be moved to a devshell asap. Just want to be sure it builds first.

homes/x86_64-linux/marley@nyx/default.nix

@@ -1,4 +1,9 @@
-{ lib, namespace, ... }:
+{
+  lib,
+  namespace,
+  pkgs,
+  ...
+}:
 let
   inherit (lib.${namespace}) enabled;
 in
@@ -7,6 +12,14 @@ in
 
   targets.genericLinux = enabled;
 
+  # TODO: Move this to a dev shell
+  home.packages = with pkgs; [
+    nixfmt-rfc-style
+    nil
+    statix
+    manix
+  ];
+
   ${namespace} = {
     isDesktop = true;