Add a tour screen once a broadcast is approved

For a training broadcast the user doesn’t get that immediate feedback
that something has happened, like they would with a real alert, or even
sending themselves a text message.

This commit adds another tour-style page which will interrupt their
journey and hopefully reinforce the message we’ve given them earlier in
the tour.

We’re adding this because we’ve found in research that users don’t have
a good grasp of the consequences and severity of emergency alerts,
versus regular text messages.

app/templates/views/broadcast/tour/6.html

@@ -0,0 +1,41 @@
+{% from "components/banner.html" import banner_wrapper %}
+
+{% extends "admin_template.html" %}
+
+{% block per_page_title %}
+  You’re still in training mode. Notify has not broadcast your alert.
+{% endblock %}
+
+{% set mainClasses = "govuk-!-padding-top-0 govuk-!-padding-bottom-0" %}
+
+{% block content %}
+
+  <div class="navigation-service">
+    <div class="navigation-service-name govuk-!-font-weight-bold">
+      {{ current_service.name }} <span class="navigation-service-type--training">Training</span>
+    </div>
+  </div>
+
+  <div class="banner-tour banner-tour-no-fixed-height banner-tour-with-service-name">
+    <div class="govuk-grid-row">
+      <div class="govuk-grid-column-one-half">
+        <h1 class="heading-medium">
+          You’re still in training mode. Notify has not broadcast your alert.
+        </h1>
+        <p class="govuk-body heading-medium">
+          In a real emergency, every mobile phone in the area
+          you chose would make a loud alarm noise.
+        </p>
+        <p class="govuk-body heading-medium">
+          <a class="govuk-link govuk-link--no-visited-state" href='{{ url_for(".service_dashboard", service_id=current_service.id) }}'>
+            Continue to dashboard
+          </a>
+        </p>
+      </div>
+      <div class="govuk-grid-column-one-half">
+        <img src="{{ asset_url('images/broadcast-tour/3.png') }}" alt="">
+      </div>
+    </div>
+  </div>
+
+{% endblock %}