Updating site to use USWDS styles (#509)

* Updated header and footer
* Updated fonts
* Moved files around and updated gulpfile to correct the build process when it goes to production
* Adjusted grid templating
* Added images to assets
* Update app/templates/components/uk_components/footer/template.njk

Co-authored-by: Steven Reilly <stvnrlly@users.noreply.github.com>

app/templates/views/service-settings/set-sms.html

@@ -17,16 +17,16 @@
   <div class="govuk-grid-row">
     <div class="govuk-grid-column-five-sixths">
       {{ page_header('Send text messages') }}
-      <p class="govuk-body">
+      <p>
         You have a free allowance of
         {{ '{:,}'.format(current_service.free_sms_fragment_limit) }} text messages each
         financial year.
       </p>
-      <!-- <p class="govuk-body">
+      <!-- <p>
         It costs 1.58 pence (plus VAT) for each text message you send
         after your free allowance.
       </p> -->
-      <p class="govuk-body">
+      <p>
         See <a class="govuk-link govuk-link--no-visited-state" href="{{ url_for(".pricing") }}">pricing</a> for more details.
       </p>
       {% call form_wrapper() %}