User can signup for an account and add a subscription

[leouofa]

Signup Flow

1. Pick Plan
2. Signup for an Account
3. Provide Billing Details
4. Start Trial (integrate with ChargeBee)
5. Deploy new RobinGood hub (integrate with Josephine)
6. Provide instructions to complete the setup.
7. Trigger new subscriber marketing and support automation.

Usage Update

1. Periodically collect the number of active users from all RobinGood hubs, and pass it onto ChargeBee.

Existing Accounts

1. Add ability to change URL
2. Add the ability to change the plan (and integrate with ChargeBee).
3. Add the ability to cancel (and integrate with ChargeBee).