Seconded! With pandoc, you'll probably be able to establish a workflow where you can go from markdown to epub and also from the same markdown to a web-ready ht

Seconded! With pandoc, you'll probably be able to establish a workflow where you can go from markdown to epub and also from the same markdown to a web-ready html and a print-ready html. You can then use weasyprint to go from the print-ready html to pdf. You can convert epub into azw for kindle using calibre, or use the epub to get into the various store ecosystems using the proprietary tools that come with those.