Add intervention banner CSS and JS

Author: MartinJJones

app/assets/javascripts/application.js

@@ -8,6 +8,7 @@
 //= require govuk_publishing_components/components/feedback
 //= require govuk_publishing_components/components/global-banner
 //= require govuk_publishing_components/components/govspeak
+//= require govuk_publishing_components/components/intervention
 //= require govuk_publishing_components/components/layout-super-navigation-header
 //= require govuk_publishing_components/components/print-link
 //= require govuk_publishing_components/components/radio

app/assets/stylesheets/application.scss

@@ -20,6 +20,7 @@
 @import "govuk_publishing_components/components/heading";
 @import 'govuk_publishing_components/components/hint';
 @import "govuk_publishing_components/components/input";
+@import "govuk_publishing_components/components/intervention";
 @import "govuk_publishing_components/components/label";
 @import "govuk_publishing_components/components/layout-footer";
 @import "govuk_publishing_components/components/layout-for-public";