Remove primary navigation import

app/frontend/styles/application.scss

@@ -45,7 +45,6 @@ $govuk-breakpoints: (
 @import "task-list";
 @import "template";
 @import "panel";
-@import "primary-navigation";
 @import "search";
 @import "sub-navigation";
 @import "unread-notification";
@@ -87,11 +86,12 @@ $govuk-breakpoints: (
   max-width: fit-content;
 }
 
-.govuk-service-navigation__active-fallback, .govuk-service-navigation__list {
+.govuk-service-navigation__active-fallback,
+.govuk-service-navigation__list {
   font-weight: bold;
 }
 
-.govuk-service-navigation__link{
+.govuk-service-navigation__link {
   @include govuk-link-common;
   @include govuk-link-style-no-visited-state;
   @include govuk-link-style-no-underline;