API data and endpoints for onboarding/signup in experience

[chazeah]

Following #10, we can dig into the signup flow. Interestingly, since the entire onboarding flow happens after the user has auth'd their Github, the flow may be able to simply reuse the endpoint exposed for the logged in views (since, in fact, the user logged in). As such, the onboarding flow will be entirely handled on the frontend; the backend will simply handle the oauth flows and API bits.

Make sense @eranrund?

FYI @youpdidou

[chazeah]

Complete, don't need any additional API endpoints.