Add Grand Master badge

source/_includes/badges.html.twig

@@ -1,15 +1,18 @@
+{% set badges = [
+    { image: 'acquia-d8-grand-master.png', alt: 'Acquia Certified Grand Master - Drupal 8 Exam Badge' },
+    { image: 'acquia-d8-developer.png', alt: 'Acquia Certified Developer - Drupal 8 Exam Badge' },
+    { image: 'acquia-d8-back-end.png', alt: 'Acquia Certified Back End Specialist - Drupal 8 Exam Badge' },
+    { image: 'acquia-d8-front-end.png', alt: 'Acquia Certified Front End Specialist - Drupal 8 Exam Badge' },
+] %}
+
 <div class="text-center">
     <a href="https://assoc.drupal.org/membership" title="I’m a Drupal Association member." class="block mb-4">
         <img src="{{ site.images_url }}/assets/images/badges/da-individual-member.png" alt="Drupal Association Individual Member" width="200" />
     </a>
 
-    <div class="mb-4 flex">
-        {% for badge in [
-            { image: 'acquia-d8-developer.png', alt: 'Acquia Certified Developer - Drupal 8 Exam Badge' },
-            { image: 'acquia-d8-back-end.png', alt: 'Acquia Certified Back End Specialist - Drupal 8 Exam Badge' },
-            { image: 'acquia-d8-front-end.png', alt: 'Acquia Certified Front End Specialist - Drupal 8 Exam Badge' },
-        ] %}
-            <div>
+    <div class="mb-4 flex flex-wrap">
+        {% for badge in badges %}
+            <div class="w-1/2">
                 <img src="{{ site.images_url }}/assets/images/badges/{{ badge.image }}" alt="{{ badge.alt }}" />
             </div>
         {% endfor %}