PlatformIO (and where has it gone)?

There appears to be a ‘PlatformIO’ section in the old github ‘Lights’ area (https://github.com/mariusmotea/diyHue/tree/master/Lights), but this has disappeared in the new ‘Lighta’ area (https://github.com/diyhue/Lights).

Is support for PlatformIO as an IDE/dev environment being discontinued (just as it is brimming one of the most popular IDE’s out there), and/or is the PlatformIO section of the old github up to date?