Add a config option to disable Preview feature

Plugin.php

@@ -2,6 +2,7 @@
 
 namespace Winter\Pages;
 
+use Config;
 use Backend\Facades\Backend;
 use Backend\Models\UserRole;
 use Cms\Classes\Controller as CmsController;
@@ -216,6 +217,10 @@ protected function extendBackendForms(): void
                 return;
             }
 
+            if (!Config::get('winter.pages::allow_page_preview', true)) {
+                return;
+            }
+
             $existingFields = array_merge(
                 array_keys($formWidget->fields ?? []),
                 array_keys($formWidget->tabs['fields'] ?? []),

config/config.php

@@ -0,0 +1,16 @@
+<?php
+
+return [
+
+    /*
+    |--------------------------------------------------------------------------
+    | Allow page preview
+    |--------------------------------------------------------------------------
+    |
+    | You can change the behavior of the page preview feature here.
+    |
+    */
+
+    'allow_page_preview' => true
+
+];