Add merge marshal badge.

source/core-team/index.html

@@ -338,13 +338,7 @@ footer: true
       </div>
       <div class="col-sm-9 col-md-9">
         <h2 class="title">Jeroen van Baarsen</h2>
-        <p></p>
-        <h3 class="title">Specialities</h3>
-        <ul>
-          <li>
-            Merge Request Officer <img src="/images/merge_request_officer/merge_request_officer_transparent.png">
-          </li>
-        </ul>
+        <img src="/images/merge_marshal/mm_badge_pgd_250.png">
       </div>
     </div>
     <div class="row">
@@ -374,13 +368,7 @@ footer: true
       </div>
       <div class="col-sm-9 col-md-9">
         <h2 class="title">Drew Blessing</h2>
-        <p></p>
-        <h3 class="title">Specialities</h3>
-        <ul>
-          <li>
-            Merge Request Officer <img src="/images/merge_request_officer/merge_request_officer_transparent.png">
-          </li>
-        </ul>
+        <img src="/images/merge_marshal/mm_badge_pgd_250.png">
       </div>
     </div>
     <div class="row">