Summary:
The docker image was not building or running correctly
after breaking out more material into core. This corrects
the necessary paths.
Test Plan:
tested by building locally with `./contain.sh ./build docker`
and running containers in development and production mode.
Reviewers: dsagal
Reviewed By: dsagal
Differential Revision: https://phab.getgrist.com/D2555
Summary: This moves enough server material into core to run a home server. The data engine is not yet incorporated (though in manual testing it works when ported).
Test Plan: existing tests pass
Reviewers: dsagal
Reviewed By: dsagal
Differential Revision: https://phab.getgrist.com/D2552
