Design the login/signup flow to be more intuitive

[david-rusnak]

Currently, there might be some issues with the app where users who are just opening it for the first time don't know that the login button appears only after entering something in both fields.

Also, the create a profile editor appears after creating an account, so does that mean we need to integrate them? This could be hard because we index into the Firestore using the users uid field which is only created after authenticating the user.

If we create a flow on paper or in Figma, it might be easier to fix it.

This should come after refactor incase it introduces breaking changes