Integrate rtd webhook as CI Pipeline

It is not directly possible to push events to readthedocs using the Generic API incoming webhook. Therefore it needs to be implemented as a CI job. @frust45

curl -X POST -d "branches=main" -d "token=1234" readthedocs.org/api/v2/webhook/tetrax/190009/

Edited Feb 25, 2022 by Koerber, Lukas (FWIN-C) - 108045

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