Fix media upload server -> move to pinata.cloud backend

[iainnash]

Description

We've cleaned up access to the upload for ZORA IPFS server and need to migrate to another solution – pinata offers a solid API and this PR migrates to the Pinata API. It also uses signed JWT to hide the private key for pinata to prevent abuse.

Motivation & context

We need to fix uploads

Code review

Ensure preview works for file upload (once API key is added to vercel for pinata).

After merging, builder protocol needs to upgrade to the paid pinata plan.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

• I have done a self-review of my own code
• Any new and existing tests pass locally with my changes
• [] My changes generate no new warnings (lint warnings, console warnings, etc)

[vercel]

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Name	Status	Preview	Updated (UTC)
nouns-builder	✅ Ready (Inspect)	Visit Preview	Aug 22, 2024 5:47pm
testnet-nouns-builder	✅ Ready (Inspect)	Visit Preview	Aug 22, 2024 5:47pm