将当前网页保存为一个纯文本的.html网页文件，不保存二进制
Save web pages into 1 html file. It keeps original image urls. The result is lightweight (very small), readable and extendable (u can save again).
IDEA : As long as servers are alive, it's ok to save just html structure and texts!
Size of html archive : 5mb~20mb =====> 500kb
based on : https://greasyfork.org/zh-CN/scripts/419798-singlefile-单文件保存网页
homepage : https://gist.github.com/KnIfER
