So I suggest replacing the links to https://facebook.github.io and https://github.com/facebookincubator/create-react-app with the correct updated links.
Yes I understand that redirects are setup properly, so there is no broken links but still it is much cleaner if they had the updated links. For example seeing the old link, a person might go to https://github.com/facebookincubator to find some other important projects there, but of course the important projects like flow type checker etc, are at https://github.com/facebook instead
I think atleast for some places like Readme(these old links are there in some Readme files) it should definitely be done, if not all places
If so, I want to volunteer for this effort. Please assign this issue to me in that case
Here is a search for these two links in the codebase:
https://github.com/facebook/react/search?q=https%3A%2F%2Fgithub.com%2Ffacebookincubator%2Fcreate-react-app
https://github.com/facebook/react/search?q=%22facebook.github.io%22