Change repository name

[PaulRBerg]

This repository is now owned by the WalletConnect organization (after being owned by me for ~4 years).

GitHub maintains URL redirects, but there are several places where it would be helpful to update the repository name:

• Internally in this repo (duh)
• Ethereum website
• useDapp
• Other results prominently appearing Google when searching for "create-eth-app"

Cc @pedrouid, @crypblizz8, and @marekkirejczyk.

[marekkirejczyk]

CC @nezouse