I've made my own web-based coding environment for working on little projects. A few years ago I found Glitch. It's great: a web-based coding environment that makes it really easy to quickly start editing a web page. It has a live preview that helps to quickly see changes take effect. But over time, as more and more of my stuff ended up living on Glitch, I was a bit uneasy about relying on someone else's service, and I also wanted to make some changes that would be idiosyncratic. In particular, I...