Remove Infura (#279)

Infura is deprecating the public gateway:
https://blog.infura.io/post/introducing-ipfs-dedicated-gateways#deprecation-of-the-public-api-and-gateway
and returning HTTP/1.1 400 Bad Request

Author: 2color

src/gateways.json

@@ -2,8 +2,6 @@
 	"https://ipfs.io/ipfs/:hash",
 	"https://dweb.link/ipfs/:hash",
 	"https://gateway.ipfs.io/ipfs/:hash",
-	"https://ipfs.infura.io/ipfs/:hash",
-	"https://infura-ipfs.io/ipfs/:hash",
 	"https://ninetailed.ninja/ipfs/:hash",
 	"https://via0.com/ipfs/:hash",
 	"https://ipfs.eternum.io/ipfs/:hash",