feat(db): Setup neo4j data migrations

Created by: Tirokk

Authored by roschaefer Jan 19, 2020 Merged Jan 23, 2020

---

🍰 Pullrequest

I use #2381 (closed) as a use case to add consistent and reliable data migrations to our backend.

Issues

• fix #2381 (closed)

Todo

• Configure migrate in docker image (production build stage)
• Implement Neo4J data store for migrate
• Refactor existing code for data tasks (seed, cleaning) into one folder db/
• Run migration on production
• Finish #1613 so we can run yarn run prod:migrate init on post-install and yarn run prod:migrate up on post-upgrade

I guess we have to do the latter manually (during a downtime)