Persist user data

Belongs to #62 (closed)

Proposed changes

Storing and loading user data so the user's login state doesn't get lost on page refresh.

Testing

• Login
• Navigate to a protected route (e.g. /creator)
• Refresh

In opposite to the pre MR's state you should be able to access the requested page.

Second try as the first MR !55 (closed) got corrupted.