Reduce unused css rules

Author: rsmithlal

app/assets/stylesheets/better_together/mailer.scss

@@ -246,16 +246,3 @@ footer.footer {
 .trix-content div {
   margin: 1em 0;
 }
-
-/* ---------- Custom Navigation Items (if needed) ---------- */
-.home_navigation_item {}
-.about_navigation_item {}
-.header-community_navigation_item {}
-.partner-organizations_navigation_item {}
-.contact_navigation_item {}
-.journey_navigation_item {}
-.faq_navigation_item {}
-.privacy-policy_navigation_item {}
-.terms-of-service_navigation_item {}
-.code-of-conduct_navigation_item {}
-.accessibility_navigation_item {}