docs: function writeSummary(output) {
      var options = output.getOptions();
      var prefix = options.get('prefix');
  
      var filePath = SUMMARY_FILE;
      var engine = WebsiteGenerator.createTemplateEngine(output, filePath);
      var context = JSONUtils.encodeOutput(output);
  
      // Render the theme
      return Templating.renderFile(engine, prefix + '/summary.html', context)
  
      // Write it to the disk
      .then(function(tplOut) {
          return writeFile(output, filePath, tplOut.getContent());
      });
  }