Add link to Redex blog article
Add link to Redex blog article

Summary:Add a link to the Redex blog article on Facebook.
Closes https://github.com/facebook/redex/pull/1

Reviewed By: onomatopoeia, dalves

Differential Revision: D3097766

Pulled By: bertmaher

fb-gh-sync-id: e4d2355d207de171071aeb3a76cc269a13e9c3c9
fbshipit-source-id: e4d2355d207de171071aeb3a76cc269a13e9c3c9

facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex