Create check-in Google Form

[wilrnh]

Ensure that we collect "How did you hear about us" as well as emails.

This is a temporary work-around until Votte supports checkins

[wilrnh]

https://docs.google.com/forms/d/e/1FAIpQLSdEnBL3zOZ1Dp1rMvxvJXOpZxa3ZaF9Lkl3O4d6cRGOflpq0Q/viewform