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If you want the lowest friction, open source, easily extensible Markdown to Web, Kindle, PDF, etc. tool, highly recommend mdBook: https://github.com/rust-lang/mdBook it’s written in Rust, but you don’t have to know any Rust to use it. And then wing is all CSS; for which there are many good (free) themes.
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Stream
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We use it to write docs in our company which are then compiled by GitHub Actions and published as GitHub Pages. The best example of a Book produced with mdBook is the Rust Lang book: https://doc.rust-lang.org/book/
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It's a short project, but here's an example in Latex+Git(hub)+Pandoc: https://github.com/cosmoosic/wool-june-rud-story
I wrote a longer novella using the same approach, the repo still private as it's in copyediting phase (but it could be opened if there's interest).