code: function inlineMargins ($) {
    $('table[style*=margin]').toNodes().forEach(($el) => {
      const { left, right } = getSideMargins($el.attr('style'))
  
      if (left === 'auto' && right === 'auto') {
        $el.attr('align', 'center')
      } else if (left === 'auto' && right !== 'auto') {
        $el.attr('align', 'right')
      } else if (left !== 'auto') {
        $el.attr('align', 'left')
      }
    })
  }
docs: finds all the tables that are centered with margins
  and centers them with the align attribute
  @param  {Cheerio} $