Button that deploys a project to Builder, similar to https://vercel.com/docs/deploy-button. If the user doesn't have an account, it would route through sign-up flow, etc.
Ideal world, there would also be some kind of onboarding checklist for projects that require external integrations (e.g., "create a private Shopify app").
Use case would be documentation, blog posts, conference slides...also enables users to share their projects, like on their own personal blogs or (maybe?) internally customer teams could shoot each other deploy links to share their work.