add wallpapers to assets, fix nh cleaning job, reenable stylix

modules/features/nixos/stylix.nix

@@ -1,6 +1,12 @@
 { inputs, self, ... }: {
   imports = [ (inputs.helpers.mkMirroredModulesFlakeModule "graphicsOptions" ({ lib, ... }: {
-    options.features.nixos.stylix.enable = lib.mkEnableOption "Stylix";
+    options.features.nixos.stylix = {
+      enable = lib.mkEnableOption "Stylix";
+      image = lib.mkOption {
+        type = lib.types.path;
+        default = /home/grey/Pictures/wallpaper.png;
+      };
+    };
   })) ];
 
   flake.nixosModules.graphics = { pkgs, lib, config, ... }: {
@@ -10,7 +16,7 @@
 
     stylix = lib.mkIf (config.features.nixos.stylix.enable) {
       enable = true;
-      image = builtins.path { path = "${self}/modules/hosts/${config.info.hostName}/wallpaper.jpg"; };
+      image = config.features.nixos.stylix.image;
       polarity = "dark";
     };