Added Stylix

hosts/common/optional/theming/themes/tokyonight/default.nix

@@ -0,0 +1,19 @@
+{
+  pkgs,
+  system,
+  inputs,
+  ...
+}: {
+  stylix.enable = true;
+
+  stylix.image = ./wallpaper.jpg;
+
+  stylix.base16Scheme = "${pkgs.base16-schemes}/share/themes/tokyo-city-dark.yaml";
+
+  stylix.fonts = {
+    monospace = {
+      package = pkgs.fira-code-nerdfont;
+      name = "Fira Code Nerd Font";
+    };
+  };
+}