Revert "Release v1.5.7: show navigation link only for quizzes"

This reverts commit e0b89931a8be986acae8a747c9089298ebf84733.
Revert "Show dataset editor navigation link only for quizzes"

This reverts commit edea0bf23ea813b5209102596543fef9ca46a9ce.
Revert v1.5.7 changes due to navigation bug