How I turn my API doc course into a PDF and sell it on Buy Me a Coffee

My API documentation course is free on the web, but I also sell a PDF version of it through Buy Me a Coffee, which has brought in about $6,700 since I started selling it in December 2021. This post walks through each step of how I turn about 170 web pages into a 975-page PDF with chapter files, including the print configuration, layout, CSS, table of contents, Prince build, chapter splitting, file hosting, and the Buy Me a Coffee setup.