Add missing end-of-page boilerplate to match techniques/index.html

Author: kfranqueiro

techniques/changelog.html

@@ -74,8 +74,15 @@ <h2>Removed Techniques</h2>
           {%- endfor %}
         </ul>
       </section>
+      <a class="button button-backtotop" href="#top"><span><svg focusable="false" aria-hidden="true" class="icon-arrow-up " viewBox="0 0 26 28">
+        <path d="M25.172 15.172c0 0.531-0.219 1.031-0.578 1.406l-1.172 1.172c-0.375 0.375-0.891 0.594-1.422 0.594s-1.047-0.219-1.406-0.594l-4.594-4.578v11c0 1.125-0.938 1.828-2 1.828h-2c-1.062 0-2-0.703-2-1.828v-11l-4.594 4.578c-0.359 0.375-0.875 0.594-1.406 0.594s-1.047-0.219-1.406-0.594l-1.172-1.172c-0.375-0.375-0.594-0.875-0.594-1.406s0.219-1.047 0.594-1.422l10.172-10.172c0.359-0.375 0.875-0.578 1.406-0.578s1.047 0.203 1.422 0.578l10.172 10.172c0.359 0.375 0.578 0.891 0.578 1.422z"></path></svg> Back to Top
+      </span></a>
     </main>
   </div>
+  <script>
+    var translationStrings = {}; /* fix WAI JS */
+  </script>
+  <script src="https://www.w3.org/WAI/assets/scripts/main.js"></script>
 </body>
 
 </html>