2020-09-20: visualizing postfix notation

2-minute video of the Mu project for the Future of Coding forum (https://futureofcoding.org) This episode is inspired by: - LoGlo (https://loglo.app/2020-06-16) - Brief (https://www.youtube.com/watch?v=R3MNcA2dpts) Main project page: https://github.com/akkartik/mu