HEFW migration script

A script written to migrate data from the old db to our PayloadCMS instance.

Setup:

1. projects.json, submissions.json and guilds.json in /data, pull from old database.
2. Create an empty array in data/failed.json, copy idmap.empty.json to idmap.json in /data.
3. If you have old images/files, put then in /images/orig/<PROJECT ID>, code will try to look in there first before downloading from url. Doesn't download if the url is the Scaleway, you have to put it in the local data.
4. Copy .env.example to .env
5. Start PayloadCMS locally, and uncomment the rate limit bypass.
6. Run this script until it's finished. It'll generate some new files in /data to help figure out what files were missing.