header(text, level) {
    const tokenHeading = {
      type: 'heading',
      raw: text,
      depth: level,
      text: text,
      tokens: [{ type: 'text', raw: text, text: text }],
    };
    return this.renderer.heading(tokenHeading);
  }
Compile the text to generate HTML heading element based on the level
@param {*} text Text content, for now it is only from the _sidebar.md file
@param {*} level Type of heading (h<level> tag), for now it is always 1
@returns