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/support/form.html

@@ -20,7 +20,7 @@
       <div class="govuk-grid-column-two-thirds">
         {% if show_status_page_banner %}
           <div class="panel panel-border-wide">
-            <p class="govuk-body">
+            <p>
               Check our <a class="govuk-link govuk-link--no-visited-state" href="https://status.notifications.service.gov.uk">system status</a>
               page to see if there are any known issues with U.S. Notify.
             </p>
@@ -32,7 +32,7 @@
               {{ form.name(param_extensions={"classes": "govuk-!-width-full"}) }}
               {{ form.email_address(param_extensions={"classes": "govuk-!-width-full"}) }}
             {% else %}
-              <p class="govuk-body">We’ll reply to {{ current_user.email_address }}</p>
+              <p>We’ll reply to {{ current_user.email_address }}</p>
             {% endif %}
             {{ sticky_page_footer('Send') }}
         {% endcall %}