integrating feedback form into app

[kir12]

at james' suggestion adding a feedback feature directly to the schedule app would make attendee access to said form easier

• option 1: external link to google forms
• option 2: create a menu page for feedback
  • on submit push data to some structureless database (e.g. s3, pushing directly onto a google sheets submission form if able)
  • validate all forms prior to submit
  • save state of form if user enters and exits form
  • optional: external validation with eventbrite to check that user is an actual registered user

issue is dependent on #60, #62, and probably #63

[kir12]

new dependency #66