docs: function PageNumber({ page, isActive, selectPage }) {
    function handleClick() {
      if (!isNaN(page)) selectPage(page)
    }
  
    let klass = classNames({
      'o-page': true,
      'o-page-current': isActive,
      'o-page-ellipsis': isNaN(page),
    })
    return (
      <button className={klass} onClick={handleClick}>
        {page}
      </button>
    )
  }