Implement SQLite

[pixup1]

Currently, all data is stored in json files in backend/storage. If we want to include more logging and stats, we need to do it in a cleaner way by storing the persistent data in a database.

To that end, we will replace the current solution with an SQLite database. This is because SQLite is easy to setup, serverless, and we do not need anything too fancy as scaling will not likely ever be an issue with CS2 servers.

This will need to replace all the current files in the backend/storage folder in order to keep the app as simple as possible.

Nevermind that