Remove Estuary support

[kallisti5]

Wah wah, it's dead now 😞

https://estuary.tech

[TheDiscordian]

Ah very sad, I really liked Estuary. Can the existing code be simply reworked for web3.storage? I think they use a similar API. Thinking about it now, unless we use CARs rn, we might need to start using those to avoid the 100MB limit.