Implement passkeys for authentication

[kevinfalting]

https://passage.1password.com/product/passkey-complete

I was dreaming up some elaborate email based authentication, but passkeys are the future and pretty darn simple, so let's use them.

They'll be valuable in allowing people to create, edit, and delete their own events, hopefully without requiring the use of an email address.

[kevinfalting]

Passage just released a react npm module: https://www.npmjs.com/package/@passageidentity/passage-react