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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@AlexOwen
I'd recommend not using the HY board (save it for something complicated) and getting an ESP8266 (on a NodeMCU for simplicity) for this project. They can run Espruino really well, albeit with not as much free memory as a Pico. I have a few running similar LEDs and they're great.
The caveat of the ESP8266 is the small amount of memory so you have to be careful programming for them. If you're worried about that then get a Pico, ESP8266 and a shim from Gordon (or get one anyway and support his awesome work).
Mixing this http://www.espruino.com/WS2811 and this http://www.espruino.com/Interactive+Web+UI you should be able to do what you want fairly nicely.