As per title. Replaced .json file with .lottie file - it is 10x smaller.
Illustrations folder went from 150mb to 5.9mb with compressed variants
of 3D models. The DracoLoader, GLTFLoader and some other logic logic is
repetitive across files, but Thomas is working on the same files at the
moment, so not touching too much to avoid conflicts with his PR. Once
he's done styling, we can extract shared logic into helpers.
