Revert "Merge remote-tracking branch 'origin/level-builder' into finished"

This reverts commit b01b69aa43bee5d59acce833d27e63ca3a1ec1a2, reversing
changes made to e5ee3e233709c9faa17be8b72d8e18c2b1bdc185.
Merge branch 'finished' of https://github.com/code-dot-org/dashboard into finished

Conflicts:
	config/scripts/custom_levels.json