Update nav link back to flexbox, override ToC to use block

Author: alex-shpak

assets/_main.scss

@@ -58,7 +58,7 @@ nav ul {
 
   a {
     padding: .5em 0;
-    display: block;
+    display: flex;
   }
 
   a[href]:hover, a[role=button]:hover {
@@ -304,6 +304,10 @@ body[dir="rtl"] .book-menu {
     @include fixed;
   }
 
+  a {
+    display: block;
+  }
+
   img {
     height: 1em;
     width: 1em;