<div class="phase-banner">
  <p>
    <strong class="phase-tag">ALPHA</strong>
    <span>This is a new service – your <a href="https://designpatterns.hackpad.com/GOV.UK-elements-feedback-sKrDyQxcfA2">feedback</a> will help us to improve it.</span>
  </p>
</div>

Move phase banner markup into an include
Move phase banner markup into an include

The phase banner appears on all pages, create an include for the
phase banner markup.
