Add proposal template add artwork

[neokry]

Description

Adds a new proposal template for adding artwork

Motivation & context

Users would like to add more artwork to DAOs. Current flow to do that requires re uploading all artwork.

Code review

• does the proposal template function properly?
• does the transaction add new artwork?

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	May 19, 2023 1:40am

1 Ignored Deployment

Name	Status	Preview	Updated (UTC)
testnet-nouns-builder	⬜️ Ignored (Inspect)		May 19, 2023 1:40am