[webrtc-encoded-transform] Pull Request: intro: remove funny hats

fippo has just submitted a new pull request for https://github.com/w3c/webrtc-encoded-transform:

== intro: remove funny hats ==
and restrict the use-cases to what we know this is being used for primarily.

fixes #122

@alvestrand PTAL.
(and note that N23 + N24 refer to something else entirely [here](https://w3c.github.io/webrtc-nv-use-cases/#requirements*))

See https://github.com/w3c/webrtc-encoded-transform/pull/148


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