move options to separate modules, set up mkDocs generation

modules/features/nixos/stylix.nix

@@ -4,8 +4,6 @@
       inputs.stylix.nixosModules.stylix
     ];
 
-    options.features.nixos.stylix.enable = lib.mkEnableOption "stylix";
-
     config = lib.mkIf (config.features.nixos.stylix.enable) {
       stylix.enable = true;
       stylix.image = builtins.path { path = "${self}/modules/hosts/${config.info.hostName}/wallpaper.jpg"; };
@@ -18,8 +16,6 @@
   };
 
   flake.homeModules.graphics = { pkgs, lib, config, ... }: {
-    options.features.nixos.stylix.enable = lib.mkEnableOption "stylix";
-
     config = lib.mkIf (config.features.nixos.stylix.enable) {
       stylix.targets = lib.mkIf (config.features.applications.gui.floorp.enable) {
         floorp.profileNames = [ "default" ];