Delete Burnable.json (#9458)
Delete Burnable.json (#9458)

This was added in https://github.com/mdn/browser-compat-data/pull/9199 but isn't part of the API:
https://wicg.github.io/serial/
chrisdavidmills/browser-compat-data,chrisdavidmills/browser-compat-data,mdn/browser-compat-data,mdn/browser-compat-data