All the codecrafters content is available on Github too, for free.
Isn't that the best part of codecrafters? Being able to just use your own text editor instead of a janky web based one which loses everything you typed on page refresh?
Every course now has a "work in your own editor" mode: you can download a zip with the starter code for every lesson plus a run_tests.sh that runs the full test suite locally. After that, you can push it to a public GitHub repo, we will judge it based on our grading system and internal tests