[ECO-2077] Create a `production` branch for the production environment, add a `README`

[xbtmatt]

Description

• [x] Create a new preview environment for PRs
• [x] Make a production branch for the stable main build
• [x] Assign environment variables based on the environment
• [x] Document how it is set up

Checklist

• [x] Did you update relevant documentation?
• [x] Did you add tests to cover new code or a fixed issue?
• [x] Did you update the changelog?
• [x] Did you check all checkboxes from the linked Linear task?

[vercel[bot]]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Comments	Updated (UTC)
emojicoin-dot-fun	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 22, 2024 10:41pm
emojicoin-dot-fun-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 22, 2024 10:41pm