[DEV] Password Protect App

[DConnorFong]

Development Task 🔧

What? ❓

This isn't really a big issue right now because the application is in dev-mode (only permitted users in the Google Developer Console) can actually create an application, but I would like to implement some sort of Password key system (settable in the environment variables) that prevents random users from creating accounts and smoking our SendGrid limits for example.

This would probably look like modifying the create user route to accept a password that is inputted on the client create account page. If this matches, then proceed as normal. If it doesn't then render an error message and prompt the user to re-enter the password or leave.