Add template partial for menu for requests

templates/requests/menu.html.to

@@ -0,0 +1,11 @@
+<div class="progress-menu">
+  <ul>
+    {% for i,s in enumerate(screens) %}
+    <li class="progress-menu__item">
+      <a href="{{ reverse_url('request_form_update', i+1, request_id) if request_id else reverse_url('request_form_new',i+1) }}">
+        {{ s['title'] }}
+      </a>
+    </li>
+    {% end %}
+  </ul>
+</div>