- 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/support/public.html

@@ -1,7 +1,7 @@
 {% extends "withoutnav_template.html" %}
 
 {% from "components/page-header.html" import page_header %}
-{% from "components/uk_components/back-link/macro.njk" import govukBackLink %}
+{% from "components/us_components/back-link/macro.njk" import govukBackLink %}
 
 {% block per_page_title %}
   The Notify.gov service is for people who work in the government
@@ -27,19 +27,19 @@
     </p>
 
     <h2 class="govuk-heading-m govuk-!-margin-bottom-1">
-      <a class="govuk-link govuk-link--no-visited-state" href="https://www.gov.uk/coronavirus">Coronavirus (COVID-19)</a>
+      <a class="usa-link" href="https://www.gov.uk/coronavirus">Coronavirus (COVID-19)</a>
     </h2>
     <p>
       Find guidance and support.
     </p>
     <h2 class="govuk-heading-m govuk-!-margin-bottom-1">
-      <a class="govuk-link govuk-link--no-visited-state" href="https://www.gov.uk/contact">Contact the government</a>
+      <a class="usa-link" href="https://www.gov.uk/contact">Contact the government</a>
     </h2>
     <p>
       Ask about benefits, driving, transport, tax, and more.
     </p>
     <h2 class="govuk-heading-m govuk-!-margin-bottom-1">
-      <a class="govuk-link govuk-link--no-visited-state" href="https://www.gov.uk/report-suspicious-emails-websites-phishing">Report internet scams and phishing</a>
+      <a class="usa-link" href="https://www.gov.uk/report-suspicious-emails-websites-phishing">Report internet scams and phishing</a>
     </h2>
     <p>
       Advice on suspicious emails and text messages.