Thanks to Victor Shepelev (@zverok) for showing us how to build (online) books w/ text (w/ markdown formatting) and the Jekyll (static) website compiler.
See the live free Ruby 2.5 Reference - https://rubyreferences.github.io/rubyref Find the Source @ https://github.com/rubyreferences/rubyref/tree/master/_src
Do you know any other books published with Jekyll? Let us know! What’s your way?