Ask HN: Having hard time finding a good alternative to gitbook.com

Having hard time finding a good alternative to gitbook.com. I'm looking for a really modern hosted service like Gitbook.com. Gitbook s support doesn't seem to respond at all. There is no way to call them, so I'm looking for something else.

I know there is gatsbyjs.com, hexo.com and others that allow us to build one, but I'm looking for plug-and-play service where I write docs in markdown/html and setup the CNAME of my company's domain and be done with it. Any suggestions would be really helpful!