Disable collaboration in data100
Disable collaboration in data100

Users are reporting some save issues on Piazza, and I
wasn't able to debug this right now. Turning this off to
see if it helps.

Ref https://github.com/berkeley-dsep-infra/datahub/issues/3027

berkeley-dsep-infra/datahub,ryanlovett/datahub,ryanlovett/datahub,berkeley-dsep-infra/datahub,ryanlovett/datahub,berkeley-dsep-infra/datahub