code: function getMarkDownItAnchorId (text) {
    text = text
      .replace(/^[<]|[>]$/g, '') // correct markdown format bold/url
    text = entities.decode(text)
      .toLowerCase()
      .trim()
      .replace(/\s+/g, '-')
    return encodeURIComponent(text)
  }
docs: getMarkDownItAnchorId - anchors used with `npm i markdown-it-anchor`
  @private
  @see: https://github.com/valeriangalliat/markdown-it-anchor/blob/master/index.js#L1
  If no repetition, or if the repetition is 0 then ignore. Otherwise append '_' and the number.
  numbering starts at 2!