Create user account when signing up & fetch user data

NOTE: You must delete your account in Firebase and then sign up again so your data can be created!

Client

Similar to AuthContext - currently just stores GP
Fetches data via GET /account when user logs in
There was a bug where it was trying to fetch data before the account data was set up - should be fixed now
- Cause: Firebase automatically logs in the user after signup - this triggered the data fetch but we had not set up the account data yet, resulting in 404.
- Fix: In the DataContext fetching, we do not run the fetch when the page is /auth/signup or /auth/login - once the user is redirected to /tavern it fetches user data as expected

Your /client/.env.local should look like this:

NEXT_PUBLIC_API = "http://localhost:3000/api/v1"

The API preview deployment was rejecting our client requests because of CORS
Added the cors package and configured Express to accept incoming requests from the client deployment - the URL is passed in as an env variable CLIENT_URL during build
- I don't think you need to update your local .env - it seemed to still work for me locally without having the CLIENT_URL set. Probably because locally it's the same origin and CORS accepts it by default