fix contrast for the light links

assets/_/styles.scss

@@ -109,7 +109,7 @@ hr {
 }
 
 a, a:hover {
-    color: #007bff;
+    color: #0071eb;
     word-wrap: break-word;
 }
 
@@ -341,6 +341,9 @@ nav#TableOfContents ul {
     h5 a:hover, h6 a:hover {
         color: $headerHover;
     }
+    a, a:hover {
+        color: #007bff;
+    }
     code {
         border-color: $bgBright;
         background-color: $bgBright;