Add a page to show delivery rates week-by-week

Implements
https://github.com/alphagov/notifications-api/pull/286

Will always show weeks as Monday to Sunday.

app/templates/views/dashboard/dashboard.html

@@ -20,6 +20,9 @@
       {% include 'views/dashboard/no-permissions-banner.html' %}
     {% endif %}
 
+    <h1 class="heading-medium">
+      In the last 7 days
+    </h1>
     {% include 'views/dashboard/today.html' %}
 
   </div>

app/templates/views/dashboard/template-statistics.html

@@ -1,21 +1,23 @@
 {% from "components/table.html" import list_table, field, hidden_field_heading, right_aligned_field_heading %}
+
 {% call(item, row_number) list_table(
   template_statistics,
-  caption="By template",
-  caption_visible=False,
+  caption="Templates",
+  caption_visible=True,
   empty_message='You haven’t used any templates {}'.format(period),
-  field_headings=['Template', hidden_field_heading('Type'), right_aligned_field_heading('Messages sent')]
+  field_headings=['Template', hidden_field_heading('Type'), hidden_field_heading('Messages sent')],
+  field_headings_visible=False
 ) %}
   {% call field() %}
     <a href="{{ url_for('.view_template', service_id=current_service.id, template_id=item.template.id) }}">
       {{ item.template.name }}
     </a>
   {% endcall %}
-  {% call field() %}
-    {{'Text message' if 'sms' == item.template.template_type else 'Email'}}
-  {% endcall %}
   {% call field(align='right') %}
     {{ item.usage_count }}
   {% endcall %}
+  {% call field() %}
+    {{'text messages sent' if 'sms' == item.template.template_type else 'emails sent'}}
+  {% endcall %}
 {% endcall %}
 

app/templates/views/dashboard/today.html

@@ -7,10 +7,7 @@
   data-interval-seconds="2"
   aria-live="polite"
 >
-  <h2 class="heading-medium">
-    In the last 7 days
-  </h2>
-  <div class="grid-row bottom-gutter">
+  <div class="grid-row">
     <div class="column-half">
       {{ big_number_with_status(
         statistics.emails_requested,
@@ -33,6 +30,9 @@
         label_link=url_for(".view_notifications", service_id=current_service.id, template_type='sms', status='delivered,failed')
       ) }}
     </div>
+    <div class="column-whole">
+      <a class="big-number-with-status-show-more-link" href="{{ url_for('.weekly', service_id=current_service.id) }}">Compare to previous weeks</a>
+    </div>
   </div>
   {% with period = "in the last 7 days" %}
     {% include 'views/dashboard/template-statistics.html' %}