Am I allowed to provide the Camera Ready Copy (CRC) / Preprint of my paper published in Springer Workshop Proceedings online on my homepage?
Yes, I do not see any reason you cannot. If you like, you put a header or footer that the paper was presented in ABC conference and the official version can be downloaded from the Springer website to save yourself from copyright issues. But I think, even without that header you should be fine. (Still, having that line in header/footer is better).
Putting it on Arxiv is more wise and professional by the way. It can give your work credibility and readability as well.