Split support into two pages

The kind of communications we’re getting at the moment can broadly be
broken down into:
- problems
- questions and feedback

We will need to triage problems differently, because they could
potentially be urgent/severe/emergency/P1/whatever language we use.
Questions or feedback will never be P1.

Two reasons for making the user categorise their tickets themselves:

- Outside of hours we can’t get someone out of bed in order to decide if
  a ticket is a problem or just feedback

- We can tailor the subsequent pages to whether it’s a problem or
  feedback (eg showing a link to the status page if the user is having
  a problem)

This commit let’s users make the choice with a pair of radio buttons.

It also cleans up a bunch of the tests and parameterizes them so we’re
testing the flow for both ticket types.

app/templates/views/support/problem.html

@@ -0,0 +1,38 @@
+{% extends "withoutnav_template.html" %}
+{% from "components/textbox.html" import textbox %}
+{% from "components/page-footer.html" import page_footer %}
+
+{% block page_title %}
+  Report a problem – GOV.UK Notify
+{% endblock %}
+
+{% block maincolumn_content %}
+
+    <h1 class="heading-large">
+      Report a problem
+    </h1>
+    <div class="grid-row">
+      <div class="column-two-thirds">
+        <div class="panel panel-border-wide">
+          <p>
+            Check our <a href="https://status.notifications.service.gov.uk">system status</a>
+            page to see if there are any known issues with GOV.UK Notify.
+          </p>
+        </div>
+        <p>What went wrong, if anything? What went well? How could we improve this service?</p>
+        <form method="post">
+            {{ textbox(form.feedback, width='1-1', hint='', rows=10) }}
+            <h3 class="heading-medium">Do you want a reply?</h3>
+            <p>Leave your details below if you'd like a response.</p>
+            {{ textbox(form.name, width='1-1') }}
+            {{ textbox(form.email_address, width='1-1') }}
+            {{ page_footer(
+              'Send',
+              secondary_link=url_for('.support'),
+              secondary_link_text='Back to support',
+            ) }}
+        </form>
+      </div>
+    </div>
+
+{% endblock %}