Fix broken links

There were still a few links pointing to `/features/using-notify`

app/__init__.py

@@ -442,15 +442,13 @@ def format_notification_status_as_field_status(status, notification_type):
     ).get(status, 'error')
 
 
-def format_notification_status_as_url(status, notification_type):
-    if notification_type == 'letter':
-        return None
-    url = partial(url_for, "main.using_notify")
+def format_notification_status_as_url(notification_type):
+    url = partial(url_for, "main.message_status")
+
     return {
-        'technical-failure': url(_anchor='technical-failure'),
-        'temporary-failure': url(_anchor='not-accepting-messages'),
-        'permanent-failure': url(_anchor='does-not-exist')
-    }.get(status)
+        'email': url(_anchor='email-statuses'),
+        'sms': url(_anchor='sms-statuses')
+    }.get(notification_type)
 
 
 def nl2br(value):

app/main/views/api_keys.py

@@ -98,7 +98,7 @@ def create_api_key(service_id):
         disabled_options = [KEY_TYPE_NORMAL]
         option_hints[KEY_TYPE_NORMAL] = Markup(
             'Not available because your service is in '
-            '<a href="{}#trial-mode">trial mode</a>'.format(url_for(".using_notify"))
+            '<a href="/features/trial-mode">trial mode</a>'
         )
     if current_service.has_permission('letter'):
         option_hints[KEY_TYPE_TEAM] = 'Can’t be used to send letters'

app/templates/components/table.html

@@ -154,11 +154,11 @@
       align='right'
     ) %}
       {% if displayed_on_single_line %}<span class="align-with-message-body">{% endif %}
-      {% if notification.status|format_notification_status_as_url(notification.notification_type) %}
-        <a href="{{ notification.status|format_notification_status_as_url(notification.notification_type) }}">
+      {% if notification.notification_type|format_notification_status_as_url %}
+        <a href="{{ notification.notification_type|format_notification_status_as_url }}">
       {% endif %}
       {{ notification.status|format_notification_status(notification.template.template_type) }}
-      {% if notification.status|format_notification_status_as_url(notification.notification_type) %}
+      {% if notification.notification_type|format_notification_status_as_url %}
         </a>
       {% endif %}
       <span class="status-hint">

app/templates/partials/notifications/status.html

@@ -1,12 +1,12 @@
 <div class="ajax-block-container">
   <p class="notification-status {{ notification.status|format_notification_status_as_field_status(notification.notification_type) }}">
-    {% if notification.status|format_notification_status_as_url(notification.notification_type) %}
-      <a href="{{ notification.status|format_notification_status_as_url(notification.notification_type) }}">
+    {% if notification.notification_type|format_notification_status_as_url %}
+      <a href="{{ notification.notification_type|format_notification_status_as_url }}">
     {% endif %}
     {{ notification.status|format_notification_status(
       notification.template.template_type
     ) }}
-    {% if notification.status|format_notification_status_as_url(notification.notification_type) %}
+    {% if notification.notification_type|format_notification_status_as_url %}
       </a>
     {% endif %}
     {% if sent_with_test_key %}

app/templates/views/message-status.html

@@ -31,7 +31,7 @@
     <p>These are the types of message status you’ll see when you’re signed in to Notify.</p>
     <p>If you’re using our API, some of the statuses you’ll see will be different. Read our <a href="{{ url_for('.documentation') }}">documentation</a> for a detailed list of API message statuses.</p>
 
-    <h3 class="heading-small">Emails</h3>
+    <h3 id="email-statuses" class="heading-small">Emails</h3>
     <div class="bottom-gutter-3-2">
       {% call mapping_table(
         caption='Message statuses – emails',
@@ -54,7 +54,7 @@
       {% endcall %}
     </div>
 
-    <h3 class="heading-small">Text messages</h3>
+    <h3 id="sms-statuses" class="heading-small">Text messages</h3>
     <div class="bottom-gutter-3-2">
       {% call mapping_table(
         caption='Message statuses – text messages',
@@ -77,7 +77,7 @@
         {% endfor %}
       {% endcall %}
     </div>
-    
+
     <h3 class="heading-small">Letters</h3>
     <div class="bottom-gutter-3-2">
       {% call mapping_table(