Explain trial mode on the settings page

The previous text on this page around trial mode was a bit of a
mouthful. Also it only really made sense if you already knew what trial
mode was.

This commit tries to make it really explicit:
- that you’re in trial mode
- what it means to be in trial mode (copied from the trial mode page)
- where you go to not be in trial mode

app/assets/stylesheets/_grids.scss

@@ -35,6 +35,10 @@
   margin-bottom: $gutter-half;
 }
 
+.bottom-gutter-2 {
+  margin-bottom: $gutter * 2;
+}
+
 .align-with-heading {
   display: block;
   text-align: center;

app/templates/views/service-settings.html

@@ -10,7 +10,7 @@
 
     <h1 class="heading-large">Settings</h1>
 
-    <div class="dashboard-table">
+    <div class="dashboard-table bottom-gutter-2">
 
       {% call mapping_table(
         caption='Settings',
@@ -37,28 +37,22 @@
           {{ edit_field('Change', url_for('.service_set_sms_sender', service_id=current_service.id)) }}
         {% endcall %}
       {% endcall %}
-
-      {% call mapping_table(
-        caption='Restrictions',
-        field_headings=['Label', 'Value', 'Action'],
-        field_headings_visible=False,
-        caption_visible=True
-      ) %}
-        {% call row() %}
-          {% if current_service.restricted %}
-            {{ text_field('Trial mode') }}
-            {{ text_field('On') }}
-            {{ edit_field('Request to go live', url_for('.service_request_to_go_live', service_id=current_service.id)) }}
-          {% else %}
-            {{ text_field('Trial mode') }}
-            {{ text_field('Off')}}
-            {{ edit_field() }}
-          {% endif %}
-        {% endcall %}
-      {% endcall %}
     </div>
 
-    {% if current_user.has_permissions([], admin_override=True) %}
+    <h2 class="heading-medium">Your service is in trial mode</h2>
+
+    <ul class='list list-bullet'>
+      <li>you can only send messages to yourself</li>
+      <li>you can add people to your team, then you can send messages to them too</li>
+      <li>you can only send 50 messages per day</li>
+    </ul>
+
+    <p>
+      To remove these restrictions
+      <a href="{{ url_for('.service_request_to_go_live', service_id=current_service.id) }}">request to go live</a>.
+    </p>
+
+    {% if false and current_user.has_permissions([], admin_override=True) %}
 
       <h2 class="heading-large">Platform admin settings</h2>