Update documentation to clarify that Hue Cloud accounts are not supported

[jrb80]

I stumbled on a thread in Discord that says that you must not login into the official Hue app with your cloud credentials. By doing so it will prevent pairing. I could not find any information about this in the documentation. I fear many people, including myself have stumbled on this. I've included a few pics that could be used in the updated documentation. Btw, note the message on the last picture that says that Hue will eventually force a cloud login, what are the implications of that...

[hendriksen-mark]

Hi, we will make this in the docs.