[BUGFIX#64914290] set cultural_activity explicity to false by default
[BUGFIX#64914290] avoid sql error for timeslots with . in the name
[#64949136] Allow multiple time_slots for contact

after deploying this commit and running migrations
further changes need to be done:

- remove Contact#belongs_to :time_slot
- remove :time_slot_id from contacts table in db
log to STDOUT in production and serve static assets
[#64949136] remove legacy db field