Update docdown options.

lib/main/build-site.js

@@ -23,9 +23,6 @@ function build(type) {
   // Remove docdown horizontal rules.
   $('hr').remove();
 
-  // Remove table of contents (toc) links.
-  $('a[href="#docs"]').remove();
-
   // Remove marky-markdown additions.
   $('[id^="user-content-"]')
     .attr('class', null)