Make the activity page update with AJAX

The activity page looks the same as the job page. So it should behave
the same and not need manually refreshing to see the new stuff.

app/templates/views/activity/notifications.html

@@ -0,0 +1,47 @@
+{% from "components/page-footer.html" import page_footer %}
+{% from "components/previous-next-navigation.html" import previous_next_navigation %}
+{% from "components/table.html" import list_table, field, text_field, link_field, right_aligned_field_heading, hidden_field_heading, row_heading, notification_status_field %}
+
+<div class="ajax-block-container">
+
+  {% if notifications %}
+    <p class="bottom-gutter">
+      <a href="{{ download_link }}" download="download" class="heading-small">Download this report</a>
+      &emsp;
+      Data available for 7 days
+    </p>
+    <div class='dashboard-table'>
+  {% endif %}
+    {% call(item, row_number) list_table(
+      notifications,
+      caption="Recent activity",
+      caption_visible=False,
+      empty_message='No messages found',
+      field_headings=['Recipient', 'Status'],
+      field_headings_visible=False
+    ) %}
+
+      {% call row_heading() %}
+        <p>
+          {{ item.to }}
+        </p>
+        <p class="hint">
+          {% if item.job %}
+            From <a href="{{ url_for(".view_job", service_id=current_service.id, job_id=item.job.id) }}">{{ item.job.original_file_name }}</a>
+          {% else %}
+            <a href="{{ url_for('.view_template_version', service_id=current_service.id, template_id=item.template.id, version=item.template_version) }}">{{ item.template.name }}</a>
+            from an API call
+          {% endif %}
+        </p>
+      {% endcall %}
+
+      {{ notification_status_field(item) }}
+
+    {% endcall %}
+  {% if notifications %}
+    </div>
+  {% endif %}
+
+  {{ previous_next_navigation(prev_page, next_page) }}
+
+</div>