delete original nav-tabs changes

src/client/styles/scss/theme/island.scss

@@ -91,14 +91,6 @@ html[dark] {
     }
   }
 
-  // .nav-tabs,
-  // .nav-tabs .nav-link.active,
-  // .nav-link {
-  //   background: none;
-  //   border-color: $primary;
-  //   border-bottom-color: $primary;
-  // }
-
   .card,
   .card-header {
     background: none;