Stripe test mode docs

Goal

Document stripe test mode flow.

What needs to be done

Document Stripe test mode - warn on not changing an existing user email, warn on not making huge Boosts.

QA

N/A

UX/Design

N/A

Mobile

N/A

Personas

Developers on the Minds team

Experiments

N/A

Acceptance Criteria

• Fine to be public
• Document how to get it working
• Document todo's and not todo's

Definition of Ready Checklist

• Definition Of Done (DoD)
• Acceptance criteria
• Weighted
• QA
• UX/Design
• Personas
• Experiments