I know you said "self hosted", but if you are interested in an Android app, Google Play Books does most of what you want, I think. You can upload your books, and read them on any device (with offline capabilities). But this is the Self Hosted community, so I will show myself out.

Thank you for the response. To be honest, I'm a bit surprised that this is not an easy task. If I understand the documentation correctly, that means, I will have to create a C# wrapper for C++ methods. I was hoping to get the wrapping for free via some tooling. I found Emscripten that looks promising (for JS), but not sure that's any different.

Community is much smaller on this side of the fence, though.

I believe Jekyll is the most popular of them and Github supports it natively. They even have documentation on how to set it up: About Github Pages and Jekyll. This page touches syntax highlighting. It also supports additional plug-ins.