ISTWCMS-3590: updating page template to use new regions

source/_patterns/03-layouts/site-container/site-container.twig

 <div class="uw-site-container">
-  {% block site_content %}
+  {% block header %}
     {% include "@layouts/header/header.twig" with {
       'menu_name': header_menu_name,
       'items': header_items
@@ -7,6 +7,15 @@
     {% include "@layouts/navigation/navigation.twig" with {
       'items': main_menu
     }%}
+  {% endblock %}
+
+  {% block highlighted %}
+  {% endblock %}
+
+  {% block main %}
+  {% endblock %}
+
+  {% block footer %}
     {% include "@layouts/footer/footer.twig" with {
       'menu_name': footer_menu_name,
       'items': footer_items