https://blog.wongcw.com/2020/05/25/%e9%ab%98%e9%80%9fgithub%e5%9c%96%e5%ba%8a%ef%bc%8c%e9%80%9a%e9%81%8ejsdelivr-cdn%e5%85%a8%e7%90%83%e5%8a%a0%e9%80%9f%ef%bc%8c%e5%9c%8b%e5%85%a7%e8%a8%aa%e5%95%8f%e6%a5%b5%e9%80%9f-autopiccdn/