Figure out if IPFS-js can store files non-redundantly

[holmesworcester]

Background: we need files as locally-stored files, but IPFS stores them as blocks. This means they exist in two places, for double the storage. We are fairly sure that ipfs-go lets you avoid this problem. Does ipfs-js?

[kingalg]

Checked with Isla on Jan 29th 2024 - this issue is old but still relevant.