Remove obsolete CSS

app/assets/stylesheets/legacy.sass.scss

@@ -1,2 +1 @@
 @import "legacy/layout";
-@import "legacy/main_nav";

app/assets/stylesheets/legacy/_main_nav.scss

@@ -1,54 +0,0 @@
-@import "variables";
-@import "mediaqueries";
-
-#main-nav {
-  width: 100%;
-  text-align: center;
-  background-color: #efefef;
-
-  .wrapper {
-    width: $content-width;
-    max-width: $content-max-width;
-    margin: 0 auto;
-  }
-
-  ul {
-    @include media-max(large) {
-      display: grid;
-      grid-template-columns: 1fr 1fr 1fr 1fr 1fr;
-    }
-
-    li {
-      @include media-min(large) {
-        display: inline;
-      }
-
-      @include media-max(large) {
-        display: block;
-      }
-
-      a {
-        display: inline-block;
-        padding: 1.5rem 2rem;
-        text-decoration: none;
-        color: $text-color-discreet;
-
-        @include media-max(large) {
-          display: block;
-          text-align: center;
-          padding-left: 0;
-          padding-right: 0;
-        }
-
-        @include media-max(small) {
-          font-size: 0.85rem;
-        }
-
-        &.active {
-          color: $text-color-body;
-          border-bottom: 2px solid #4ea2df;
-        }
-      }
-    }
-  }
-}