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Upgrade to MongoDB 4

Since we will deploy Phase 0 during the semester, we wait upgrading MongoDB till after the semester, where we also might be able to delete the old content in the MongoDB's.

quiz-db       mongo                 (official)
sharelatex-db mongo                 (official)

Looks like we can't stay with MongoDB 3.0.12 for the quiz anymore. https://hub.docker.com/_/mongo/

Sharelatex uses mongo:4.0.0 so that shouldn't be a problem. I'll upgrade Sharelatex as one of the last things before feature freeze. Ideally the Quiz is upgraded to use the same version of MongoDB as Sharelatex.

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information