code: public static function step($content, $options = [])
      {
          Ui::addCssClass($options, 'step');
          $tag = ArrayHelper::remove($options, 'tag', 'div');
          return Ui::tag($tag, $content, $options);
      }
docs: Renders a step element item @see http://semantic-ui.com/elements/step.html
  
  @param string $content the content of the item
  @param array $options the tag options in terms of name-value pairs
  
  @return string the generated step item tag