[Question bank] Update question bank

[widal001]

Summary

Update and expand the question bank with the questions identified in #590 and link the question bank index page to the navbar and sidebar.

Additional improvements

• Try to re-use components across question bank and custom field catalog
• Experiment with options for re-using or merging:
  • x-ui-schema
  • x-mapping-to-cg
  • x-mapping-from-cg
• Add remainder of questions that map to ProposalBase
• Add some extensions for concepts like:
  • Fiscal sponsor (Org)
  • Principal Investigator (Contact)
  • Other common concepts that show up across forms

Acceptance criteria

• Question bank contains at least 25 questions
• Question bank is linked from navbar and sidebar