Update README.MD #121
Description
I've just read that visbrain is no longer maintained (which I have understanding for, I know how time consuming maintenance can be).
Would it be possible to update the README to reflect these changes? Additionally, it might be an idea to either archive the project and/or to redirect to https://github.com/x64-bit/sleep-scoring which seems to contain an updated version
Additionally, all links to visbrain.org should be removed, as it redirects to a scam site. Could change the links to https://cognitive-neuroscience-open-tools.github.io/visbrain/
related #117