Colorblind-Friendly Design Guide for Developing Apps

I thought I first saw this on Lobste.rs, but I guess not since it hasn't been submitted previously, it seems.

I read https://lobste.rs/s/g0te8h/how_choose_colors_for_your_cli and remembered having read and saved this excellent, actionable guide on choosing colors prioritizing a11y: color, icon, and text.