Add tokens as alternatives to basicauth

[Reinachan]

Current method for handling authentication is to base32 encode the username and password and add it as a cookie. Each time the user does any action that requires authentication, the server needs to verify the password with bcrypt. This is a slow process, leading to an unresponsive interface.

The server should instead use a randomly generated token that can be stored in the database for faster verification. This token can be generated using the getrandom crate.