Make use of aria-current as selector and remove use of active class.

assets/sass/_zen.scss

@@ -196,17 +196,13 @@ figure {
     }
 
     &:active,
-    &.active {
+    &[aria-current] {
       background-color: var(--color-brand);
       text-decoration: underline;
     }
   }
 }
 
-.menu a.active {
-  text-decoration: none;
-}
-
 // Search
 
 .search-text {

assets/sass/base/links/_links.scss

@@ -32,6 +32,12 @@ a:active {
   color: var(--color-link-active);
 }
 
+// Remove underline from links to current page to
+// indicate that there is no need to click on it.
+[aria-current] {
+  text-decoration: none;
+}
+
 .link-nav,
 %link-nav {
   a {