Allow migration for Builder, Purple and the Park

[neokry]

Description

Adds Builder, Purple and the Park to the allowed migration list. Also removes other networks as an option for migration in favor of base.

Type of change

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

Checklist

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

[vercel[bot]]

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Name	Status	Preview	Updated (UTC)
nouns-builder	✅ Ready (Inspect)	Visit Preview	Mar 7, 2024 5:44pm
testnet-nouns-builder	✅ Ready (Inspect)	Visit Preview	Mar 7, 2024 5:44pm