feat(nixos:appearance): move appearance options to nixos

nixos/options/appearance/colors.nix

@@ -0,0 +1,30 @@
+{
+  config,
+  lib,
+  ...
+}: let
+  inherit (lib) mkOption;
+  inherit (lib.types) str enum attrsOf;
+
+  cfg = config.ooknet.colorscheme;
+in {
+  # simple colorscheme module bases on misterio77/nix-colors
+  options.ooknet.colorscheme = {
+    name = mkOption {
+      type = enum ["hozen"];
+      default = "hozen";
+    };
+    variant = mkOption {
+      type = enum ["dark" "light"];
+      default = "dark";
+    };
+    slug = mkOption {
+      type = str;
+      default = "${toString cfg.name-cfg.variant}";
+    };
+    palette = {
+      type = attrsOf str;
+      default = (import ./palettes/${cfg.slug}.nix).colorscheme.palette;
+    };
+  };
+}