Add cassette to IPFS provider peering

[masih]

Get the peer ID of prod cassette onto https://docs.ipfs.tech/how-to/peering-with-content-providers/ so others can peer with us.

[willscott]

the IDs of prod cassette are:

/dns/cassette.prod.cid.contact/tcp/40090/p2p/12D3KooWAWotmkS2KKRYaJWHDx9jPfKXT9k8jAiThKH5oVRnbB1m