add nh, fix description eza

fix nh

modules/nixos/cli/nh/default.nix

@@ -0,0 +1,26 @@
+{
+  config,
+  lib,
+  namespace,
+  ...
+}:
+with lib;
+with lib.${namespace};
+let
+  cfg = config.${namespace}.cli.nh;
+in
+{
+  options.${namespace}.cli.nh = with types; {
+    enable = mkBoolOpt false "Whether or not to use nh.";
+  };
+
+  config = mkIf cfg.enable {
+    programs.nh = {
+      enable = true;
+      clean.enable = true;
+      clean.extraArgs = "--keep-since 4d --keep 3";
+      flake = "/home/philipp/Documents/nix-config";
+    };
+  };
+
+}