Remove external link styling
Remove external link styling

The external link icon, and associated mixin, were deprecated in
https://github.com/alphagov/govuk_frontend_toolkit/pull/293

This means we can’t and shouldn’t use them any more.

gov-cjwaszczuk/notifications-admin,gov-cjwaszczuk/notifications-admin,gov-cjwaszczuk/notifications-admin,alphagov/notifications-admin,alphagov/notifications-admin,alphagov/notifications-admin,gov-cjwaszczuk/notifications-admin,alphagov/notifications-admin