2475 - Update target="_blank" links

app/templates/views/about/about.html

@@ -16,7 +16,10 @@
     <li>More effectively deliver program outcomes</li>
     <li>Save administrative costs</li>
     <li>Implement <a class="use-link usa-link--external"
-        href="https://digital.gov/resources/delivering-digital-first-public-experience/" target="_blank">21st Century
+        href="https://digital.gov/resources/delivering-digital-first-public-experience/"
+        rel="noopener noreferrer"
+        target="_blank"
+        aria-label="21st Century IDEA (opens in a new tab)">21st Century
         IDEA</a> and other directives</li>
   </ul>
   <p>Notify.gov is an easy-to-use, web-based platform. It requires no technical expertise or system integration — users

app/templates/views/about/security.html

@@ -22,7 +22,10 @@
   </ul>
   <p>
     Notify.gov operates under a full three-year <a class="use-link usa-link--external"
-      href="https://digital.gov/resources/an-introduction-to-ato/" target="_blank">Authority-to-Operate (ATO)</a>. This
+      href="https://digital.gov/resources/an-introduction-to-ato/"
+      target="_blank"
+      rel="noopener noreferrer"
+      aria-label="Authority-to-Operate (ATO) (opens in a new tab)">Authority-to-Operate (ATO)</a>. This
     federal security authorization process leverages security
     controls provided by National Institute of Standards and Technology (NIST).
   </p>