#78 create flags that check if user has been through onboarding

[DevinCLane]

Closes #78

Description

Pretty bigly PR. Does a bunch of things:

Backend stuff

• Adds a flags table to allow setting of flags on users. Used in this case to flag whether a user has skipped onboarding
• Adds new endpoints:
  • GET /api/auth/current-user which returns the logged-in user and flags
  • PUT /api/user/onboarding/skip which upserts the skipped onboarding flag for the logged-in user
• Modifies endpoints:
  • POST /api/auth/login returns flags as well
• Adds a getter profile to the User model that will get us the public, client-friendly object, so we don't have to call _.pick every time we want to send that data along

Testing:

• Adds/updates tests so new/updated endpoints are all passing
• Removed the truncateDatabase function as this is an antipattern and we should generally not allow a single test to impact other tests
• Thanks to the above change, tests can now run in parallel
• Added the ability for tests to run on a specific, fresh database, so that if the global DB state matters, it's easier to manage/predict
• Cypress tests now have a baseURL so you don't have to include localhost:3000 in all of the cy.visits

Frontend stuff:

• Adds flags to the auth store
• App uses the new current-user route for getting logged-in user data, plus populating the context instead of the public profile/id one.

Testing

Manually by clearing the DB, logging in, clicking "skip onboarding", then logging out, logging in again, and it should put you right on /directory and not the onboarding page

Plus server tests

Type of change

• New feature (non-breaking change which adds functionality)

Screenshots

Please include any screenshots if there are visual changes.

Checklist:

• [x] Changes have new/updated automated tests, if applicable
• [x] Changes have new/updated docs, if applicable
• [x] I have performed a self-review of my own code
• [x] I have added comments on any new, hard-to-understand code
• [x] Changes have been manually tested
• [x] Changes generate no new errors or warnings

[timmyichen]

@DevinCLane do you need re-review, or is there anything we can do to help with this PR?

[DevinCLane]

I'm not feeling well, so if this is blocking feel free to have someone else take it over! A re-review could be good in the meantime?