I forked a fork of this and added extra functionality, including rating and sharing machines, variable simulation speed and canvas size here: https://aesort.com/Turing-Drawings/
Thanks. I really needed this when I was in college studying "Theory of computation". I promised my classmates I would make a tool that would produce step by step soltuoins with diagarms and eventually made a really hacky one. I didnt have much experience at the time so failed to find a premade solution.