What do pages like Rust Book and Rust By Example use?

What does Rust Book and Rust By Example use? Like, is there a software they use to generate that HTML with that left sidebar with section navigation?

That is the sidebar I'm referring to:

I see that several Rust project docs or books use that same base. And in particular I'd like to set the code font to Courier New if possible.

It's GitHub - rust-lang/mdBook: Create book from markdown files. Like Gitbook but implemented in Rust.


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