code: function processVars (markdownContent, config) {
    if (config.variables && Array.isArray(config.variables)) {
      config.variables.forEach((v) => {
        markdownContent = markdownContent.replace(new RegExp('%' + v.name + '%', 'g'), v.content);
      });
    }
    if (config.base_url) {
      markdownContent = markdownContent.replace(/%base_url%/g, config.base_url);
    }
    if (config.image_url) {
      markdownContent = markdownContent.replace(/%image_url%/g, config.image_url);
    }
    return markdownContent;
  }
docs: Replace content variables in Markdown content