[docs] fix receiver_creator supported pipelines

[rogercoll]

Testing: Added logs receiver creation test case.

Documentation: Remove traces and logs from README's header.

Receiver implements: receiver.Metric

Trying a receiver configuration in a logs or traces pipeline returns the following error:
Error: cannot build pipelines: failed to create "receiver_creator/1" receiver, in pipeline "logs": telemetry type is not supported

[rogercoll]

Skip changelog?

[runforesight]

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⭕  changelog workflow has finished in 3 seconds (2 minutes 3 seconds less than main branch avg.) and finished at 6th Feb, 2023.

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⭕  build-and-test-windows workflow has finished in 3 seconds (40 minutes 8 seconds less than main branch avg.) and finished at 6th Feb, 2023.

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✅  load-tests workflow has finished in 19 minutes 51 seconds (⚠️ 5 minutes 1 second more than main branch avg.) and finished at 6th Feb, 2023.

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[djaglowski]

Based on the code I agree that only metrics are supported.