Finish up Firebase Google Authentication + other email sign up

[palak-bhargava]

• Give users the option to sign up/in with Google
• Create an option for user to sign up for an account using any email
• Create a practice database just to get the user profile functionality working
  - the user should be able to add a username, email, and password
  - the user should be able to sign in using the email and password
  - this information should show up in the database!
  - we can build from there