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/add-service-local.html

@@ -14,13 +14,13 @@
 
     {{ page_header('About your service') }}
 
-    <p class="govuk-body">Give your service a name that tells users what your messages are about, as well as who they’re from. For example:</p>
+    <p class="usa-body">Give your service a name that tells users what your messages are about, as well as who they’re from. For example:</p>
         <ul class="govuk-list govuk-list--bullet">
           <li>School admissions – {{ current_user.default_organisation.name }}</li>
           <li>Electoral services – {{ current_user.default_organisation.name }}</li>
           <li>Blue Badge – {{ current_user.default_organisation.name }}</li>
         </ul>
-        <p class="govuk-body">You should only use an acronym or initialism if your users are already familiar with it.</p>
+        <p>You should only use an acronym or initialism if your users are already familiar with it.</p>
 
     {% call form_wrapper() %}