I like your project.

The fact that Gitbook is no longer maintained is a sad news for me. I don't usually write books but I my favorite to maintain a product manuel is to use Gitbook. For example, here is a prototype for my recent project: https://xxz.jakehao.com

At a first glance Asciibook's interface is not eye appealing as Gitbook. I hope your project can keep the momentum and hope to use it in production one day!