add sample snippet to show the create campaign button on post types of type page as well

Author: dannyvankooten

sample-code-snippets/premium/post-campaign/add-post-types.php

@@ -0,0 +1,7 @@
+<?php
+
+add_filter('mc4wp_post_campaign_post_types', function ($types) {
+    // also show the "Create Mailchimp campaign" section for post types of type page
+    $types[] = 'page';
+    return $types;
+});