Add stylix but leave disabled

themes/sandstone-forest/default.nix

@@ -0,0 +1,28 @@
+{ config, pkgs, ... }:
+
+{
+  stylix.image = ./wallpaper.jpg;
+  stylix.polarity = "dark";
+
+  stylix.fonts = {
+    serif = {
+      package = pkgs.dejavu_fonts;
+      name = "DejaVu Serif";
+    };
+
+    sansSerif = {
+      package = pkgs.dejavu_fonts;
+      name = "DejaVu Sans";
+    };
+
+    monospace = {
+      package = pkgs.nerdfonts.override { fonts = [ "JetBrainsMono" ]; };
+      name = "JetBrainsMono Nerd Font";
+    };
+
+    emoji = {
+      package = pkgs.noto-fonts-emoji;
+      name = "Noto Color Emoji";
+    };
+  };
+}

themes/targets/all.nix

@@ -0,0 +1,3 @@
+{
+  stylix.autoEnable = true;
+}