Work through the new user sign up flow

[mririgoyen]

Proposed Changes

Adds new changes to the API and updates to the client site to support new user flow.

Types of Changes

What types of changes does your code introduce?

• [ ] Documentation Update
• [ ] Bugfix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

• [x] I have read the Contributing doc.
• [x] Lint passes locally with my changes.
• [x] I have added necessary documentation (if appropriate).

Additional Information