made zip file link a button

srctweb/_pages/documents/logos.html

@@ -8,7 +8,9 @@ permalink: /documents/logos/
     <div class="row">
       <div class="col">
         <a href="/assets/media/srct-logos.zip">
-         Download collected assets <i class="fa fa-download fa-fw"></i>
+         <button type="button" class="btn btn-primary">
+           Download collected assets <i class="fa fa-download fa-fw"></i>
+         </button>
         </a>
       </div>
     </div>