Add link to request to go live from ‘Using Notify’

We used to have this link. It went away at some point. This should
reduce the number of users raising support tickets asking ‘how do I get
a live API key’ and similar.

app/templates/views/using-notify.html

@@ -14,11 +14,18 @@
   <div class="column-two-thirds">
 
     <h1 class="heading-large">Using Notify</h1>
-    
+
     <h2 id="trial-mode" class="heading-medium">Trial mode</h2>
     <p>When you create a GOV.UK Notify account, you’ll start in trial mode. This lets you try out the service, but has some restrictions in place.</p>
-    <p>You can remove these restrictions by going live.</p>
-    
+    <p>
+      You can remove these restrictions by
+      {% if current_service and current_service.restricted %}
+        <a href="{{ url_for('.request_to_go_live', service_id=current_service.id) }}">requesting to go live</a>.
+      {% else %}
+        going live.
+      {% endif %}
+    </p>
+
     <h3 class="heading-small">Restrictions in trial mode</h3>
     <p>In trial mode, you can:</p>
     <ul class="list list-bullet">
@@ -65,7 +72,7 @@
     <p>When you’ve done this, users will be able to reply to text messages you send them. They’ll also be able to start an interaction by sending you a text message.</p>
     <p>You’ll be able to see and reply to text messages you receive. You can also create automated processes to manage replies.</p>
     <p>You’ll still need to have a manual process in place for any messages that can’t be dealt with automatically.</p>
-    
+
     <h2 class="heading-medium">Multiple services in one organisation</h2>
     <p>If your organisation offers multiple services, you can have a different Notify account for each of them.</p>
     <p>Each service:</p>
@@ -73,11 +80,11 @@
       <li>gets its own free message allowance</li>
       <li>has to request to go live separately</li>
     </ul>
-    
+
     <h2 class="heading-medium">Letters</h2>
-    <p>Letters can be up to 6 pages long (3 sides of paper, double-sided).</p> 
+    <p>Letters can be up to 6 pages long (3 sides of paper, double-sided).</p>
     <p>Notify sends letters in C5 size envelopes, with a window.</p>
-    
+
   </div>
 </div>