[ECO-2268] Add maintenance page

[CRBl69]

Description

This PR adds the sickest maintenance page you've ever seen.

Testing

Go to /maintenance on the vercel preview.

Checklist

• [x] Did you check all checkboxes from the linked Linear task?

[vercel[bot]]

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Name	Status	Preview	Comments	Updated (UTC)
emojicoin-dot-fun	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 18, 2024 9:05pm
emojicoin-dot-fun-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 18, 2024 9:05pm