ISTWCMS-4199: fixing header template to match pattern-lab

templates/regions/region--header.html.twig

@@ -12,12 +12,11 @@
  * @see template_preprocess_region()
  */
 #}
-{% embed '@layouts/header/header.twig' with {
-  'classes': classes
-}%}
-
-  {% block content %}
-    {{ content }}
-  {% endblock %}
+{% set main_menu = simplify_menu('main') %}
 
-{% endembed %}
+{% include '@layouts/header/header.twig' with {
+  'site_name': 'TESTING',
+  'faculty': faculty,
+  'classes': classes,
+  'nav_items': main_menu.menu_tree
+}%}