request: return (not echo) the output

Hi,

To prevent the output (list of sites) showing before (above) the post content where the shortcode is placed, use return instead of echoing the list from within the shortcode function.

The end of the main function would then look like this (with class added to allow custom styling) :

[...]
		$echo = "<ul class=\"site-list\">";
		while (list($key, $value) = each($siteList)) {
     			$echo .= "<li><a target=\"_blank\" href=\"https://" . $value . "\">" . $key . "</a></li>";
		}
		$echo .= "</ul>";
		return $echo;
	} else {
		return "";
	}
}