refactor fb.me redirect link to original link

[cylim]

Summary

ref #16109

The reason for these quick changes is to allow developers from countries or corporations that blocked Facebook(Social Media) to view error/warning messages in detail.

Issues

1. I did not fix the link https://fb.me/react-mock-scheduler due to it is an invalid link and it related to Experiment features.
2. It will be better to use another short link redirect tool because some links are gist, GitHub issues, and some links are pretty long.

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[gaearon]

Appreciate the intent, but it would be good to discuss the plan before making the change.
In particular, we definitely do not want to hardcode specific paths into warnings since they may go 404 eventually.

Instead, what we should do is add a redirect path to the website itself (e.g. https://reactjs.org/link/<...>) and then port to those.