Put some statistics on the dashboard

This commit adds two new sections to the dashboard

1. A banner telling you about trial mode, including a count of how many messages
   you have left today, which is a restriction of trial mode

2. Panels with counts of how many emails and text messages have been sent in a
   day, plus the failure rates for each

It does **not**:
- link through to any further information about what trial mode is (coming
  later)
- link through to pages for the failure rates (coming later)
- change the ‘recent jobs’ section to ‘recent notifications’

app/templates/views/dashboard/dashboard.html

@@ -0,0 +1,20 @@
+{% extends "withnav_template.html" %}
+
+{% block page_title %}
+  {{ session.get('service_name', 'Dashboard') }} – GOV.UK Notify
+{% endblock %}
+
+{% block maincolumn_content %}
+
+  {% if service.restricted %}
+    {% include 'views/dashboard/trial-mode-banner.html' %}
+  {% endif %}
+
+  {% if not jobs %}
+    {% include 'views/dashboard/get-started.html' %}
+  {% else %}
+    {% include 'views/dashboard/today.html' %}
+    {% include 'views/dashboard/jobs.html' %}
+  {% endif %}
+
+{% endblock %}

app/templates/views/dashboard/get-started.html

@@ -0,0 +1,19 @@
+{% from "components/banner.html" import banner_wrapper %}
+
+<h2 class="heading-medium">Get started</h2>
+<ol class="grid-row">
+  {% if current_user.has_permissions(['manage_templates']) %}
+    <li class="column-half">
+      {% call banner_wrapper(type="tip", subhead='1.' if not templates else None, with_tick=templates|length) %}
+        <a href='{{ url_for(".add_service_template", service_id=service_id, template_type="sms") }}'>Add a template</a>
+      {% endcall %}
+    </li>
+  {% endif %}
+  {% if current_user.has_permissions(['send_texts', 'send_emails', 'send_letters']) %}
+    <li class="column-half">
+      {% call banner_wrapper(type="tip", subhead='2.') %}
+        <a href='{{ url_for(".choose_template", service_id=service_id, template_type="sms") }}'>Send yourself a message</a>
+      {% endcall %}
+    </li>
+  {% endif %}
+</ol>

app/templates/views/dashboard/jobs.html

@@ -0,0 +1,28 @@
+{% from "components/table.html" import list_table, field, right_aligned_field_heading, hidden_field_heading %}
+
+{% call(item) list_table(
+  jobs,
+  caption="Recent batch jobs",
+  empty_message='You haven’t sent any text messages yet',
+  field_headings=['File', 'Started', right_aligned_field_heading('Rows'), right_aligned_field_heading('Sent')]
+) %}
+  {% call field() %}
+    <a href="{{ url_for('.view_job', service_id=service_id, job_id=item.id) }}">{{ item.original_file_name }}</a>
+  {% endcall %}
+  {% call field() %}
+    {{ item.created_at|format_datetime }}
+  {% endcall %}
+  {% call field(align='right') %}
+    {{ item.notification_count }}
+  {% endcall %}
+  {% call field(align='right') %}
+    {{ item.notifications_sent }}
+  {% endcall %}
+{% endcall %}
+{% if more_jobs_to_show %}
+  {% if current_user.has_permissions(['send_texts', 'send_emails', 'send_letters']) %}
+    <p class="table-show-more-link">
+      <a href="{{ url_for('.view_jobs', service_id=service_id) }}">See all sent text messages</a>
+    </p>
+  {% endif %}
+{% endif %}

app/templates/views/dashboard/today.html

@@ -0,0 +1,25 @@
+{% from "components/big-number.html" import big_number_with_status %}
+
+<h2 class="heading-medium">
+  Sent today
+</h2>
+<div class="grid-row">
+  <div class="column-half">
+    {{ big_number_with_status(
+      statistics.get('emails_requested', 0),
+      'email' if statistics.get('emails_requested') == 1 else 'emails',
+      '{}%'.format(statistics.get('emails_failure_rate', 0)),
+      'failed',
+      statistics.get('emails_percentage_of_danger_zone', 0)
+    ) }}
+  </div>
+  <div class="column-half">
+    {{ big_number_with_status(
+      statistics.get('sms_requested', 0),
+      'text message' if statistics.get('sms_requested') == 1 else 'text messages',
+      '{}%'.format(statistics.get('sms_failure_rate', 0)),
+      'failed',
+      statistics.get('sms_percentage_of_danger_zone', 0)
+    ) }}
+  </div>
+</div>

app/templates/views/dashboard/trial-mode-banner.html

@@ -0,0 +1,24 @@
+{% from "components/banner.html" import banner_wrapper %}
+{% from "components/big-number.html" import big_number %}
+
+{% call banner_wrapper(type="mode") %}
+
+  <div class="grid-row">
+    <div class="column-one-half">
+      <h2 class="heading-medium">Trial mode</h2>
+      <p>
+        We’ll only deliver messages to you and members of your team
+
+      </p>
+    </div>
+    <div class="column-one-sixth">
+      &nbsp;
+    </div>
+    <div class="column-one-third">
+      {{ big_number(
+        service.limit - statistics.get('emails_requested', 0) - statistics.get('sms_requested', 0),
+        'messages left today'
+      ) }}
+    </div>
+  </div>
+{% endcall %}