/**
     * Make a form builder.
     *
     * @return Form
     */
    protected function form()
    {
        return Form::make(new Config(), function (Form $form) {
            $form->text('name','后台名称');
            $form->image('logo','logo');
            $form->text('domain','文档域名');
            $form->text('doc_folder','文档目录');
            $form->saved(function (Form $form){
                return  $form->response()->redirect("/config/1/edit");
            });
        });
    }