Add rel="noopener" to social links

To prevent the new page from being able to access the window.opener property and ensures it runs in a separate process.

templates/components/common/social-links.html

@@ -2,7 +2,7 @@
     <ul class="socialLinks socialLinks--alt">
         {{#each social_media}}
             <li class="socialLinks-item">
-                <a class="icon icon--{{display_name}}" href="{{url}}" target="_blank">
+                <a class="icon icon--{{display_name}}" href="{{url}}" target="_blank" rel="noopener">
                     <svg><use xlink:href="#icon-{{display_name}}" /></svg>
                 </a>
             </li>