- Removed links to the gov uk stylesheets

- Deleted /stylesheets folder
- Removed sass build from gulpfile
- Changed gov links to usa links
- Changed other govuk styles, like breadcrumbs
- Changed name of uk_components file to us_components
- Fixed a few tests that broke on account of the changes

app/templates/views/platform-admin/get-users-report.html

@@ -30,7 +30,7 @@
     ) %}
       {% for column_heading, description in [
         ('sms cost', 'The total cost of text messages sent after a service has used its free allowance.'),
-        ('sms chargeable units', 'The number of fragments sent after a service has used its free allowance. This number takes into account the cost multiplier for <a class="govuk-link govuk-link--no-visited-state" href="https://www.notifications.service.gov.uk/pricing#international-numbers">sending international text messages</a>.' | safe),
+        ('sms chargeable units', 'The number of fragments sent after a service has used its free allowance. This number takes into account the cost multiplier for <a class="usa-link" href="https://www.notifications.service.gov.uk/pricing#international-numbers">sending international text messages</a>.' | safe),
         ('purchase order number, contact names, contact email addresses and billing reference', 'We add this data manually based on the information we get from services. You can help by adding it to the service settings page.'),
       ] %}
         {% call row() %}