code: function insertAnchors(content) {
      var $ = cheerio.load(content);
      $(':header').each(function(i, elem) {
          var header = $(elem);
          var id = header.attr("id");
          if (!id) {
              id = slug(header.text());
              header.attr("id", id);
          }
          header.prepend('<a name="' + id + '" class="plugin-anchor" '
                     + 'href="#' + id + '">'
                     + '<i class="fa fa-link" aria-hidden="true"></i>'
                     + '</a>');
      });
      return $.html();
  }
docs: insert anchor link into section