Remove GET /ipfs/{CID}

[bmann]

We keep getting people who hit the (unauthenticated) GET request at /ipfs/{CID}, instead of using the gateway.

This may make sense in some cases, but I'm not sure where.

Should we deprecate this end point? Or make it authenticated?

[bmann]

For now, I have removed it from the guide docs, for starters https://guide.fission.codes/developers/web-api

Still need to do this for the 2.3.x branch, too.

[expede]

Let's go ahead and remove this endpoint