Calendar signup form

[robmoffat]

Creating a first PR to look at event signup workflow.

Implements #154

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[robmoffat]

@TheJuanAndOnly99 I need some help with this. I've added a signup form, but I get an error when trying to sign people up:

  Error: Service accounts cannot invite attendees without Domain-Wide Delegation of Authority.
 

... perhaps we can discuss this in the new year when you get back?

Also @mimiflynn fyi, I'm using Gatsby for this, so this incorporates some of your changes, probably out-of-sync.

Let's see if we can work on closing these both out.