Dockerize Mongo

[alicesf2]

Resolves #367

• Added the db service to the docker-compose.yml file
• Removed all commands from ./recreate_db.sh except for dotenv yarn populatedb
• Removed unused backend .env variables

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[josh-byster]

Looks great, Alice! 🚀

Small thing: to allow us to populate the DB and have the full "Docker experience", let's do as much as we can inside the Docker container itself. Hence it would make sense to spin up a container and seed the database from inside that container. To do this we can change the populatedb script in the package JSON file to docker-compose run backend node src/utils/populate.js, which will spin up a container, run the same command inside the container, and then remove the container.

This way, the user doesn't even need NodeJS installed on their machine to run our app—it runs within the docker container which is created from the NodeJS image and hence already has node installed.