Update Espressif story #198
Description
The abandonment note on esp-rs in favor of building rustc on Espressif's LLVM and the related quickstart repo indicate that mrustc is not the way to go on ESP32 / ESP8266 / Xtensa cores any more.
I don't have the devices at hand or experience with that platform, but the current information in this repo seems to be outdated. @emosenkis or @rahul-thakoor, could you maybe have a look at that?