Update on the Mu computer's memory-safe language

Since the language is starting to seem stable, and the error messages have been getting better, and I managed to build some little programs without too much trouble, I figured it was time to start actually talking about the Mu language in the documentation. So make way SubX, and yield center-stage to Mu.

https://github.com/akkartik/mu/blob/master/README.md#toolchain

https://github.com/akkartik/mu/blob/master/mu.md

This post is part of my Freewheeling Apps Devlog.

Comments gratefully appreciated. Please send them to me by any method of your choice and I'll include them here.