RawGit is being shut down (eg Oct 2019, https://rawgit.com/) and this change uses the direct links to the files as served from gist.github.com. The same files are being served, just that the links are only dependent on GitHub's gist service.
* Rewrite "adding React to existing app"
Fixes#988
* Some copy
* typo
* Update babel instructions
* Update umd link
* Add prod minification section
* Show "button" example in several targets
* wip
* More
* More
* tweak
* yas
* Multi root tip
* moaar
* alot
* Tweak links
* Explain better
* better lead
* tweaks
* tweaks
* wording
* More reassuring tone
* Grammar
* wording
* feedback from readers
* Use id, not class
* More nits
* Re-add a useful section
David Beitey
Camilo Giraldo
Arvindeva Wibisono
Michał Gołębiowski-Owczarek
Nat Alison
Alex Krolick
embs
Dan Abramov
Kristofer Selbekk
Sylvan Mably