"In Production" status for questions

Closes #111 (closed) Add "In Production" questions for questions

• add migration to add new column inProduction in QuestionVersion table
• create mutation, resolver, controller to update the field value
• read inProduction value from question and dashboard queries
• add "In Production" ui state in Question component
  • comes after "Under Review"
  • question is editable only when it's in production
  • show the publish button when question is in production
• modify QuestionItem to reflect "In Production" status in the Dashboard
• tweak Question and QuestionItem stories to show the new status

Additional fix:

• read rejected value in author dashboard query, to properly label rejected questions in author dashboard