Create backend for donation of devices

[pydanny]

What should we change and why?

We are going to use Zapier and Google Spreadsheets, Documents, and Email.

• Using a MHF google account, create spreadsheet that matches the data submitted by give-devices.js
• Connect a Zapier zap to the Google spreadsheet
• Add a secret endpoint in the Zapier zap
• Track zapier endpoint with env vars
• Use the give-devices.js submit handler to send submissions to the zapier endpoint
• Document how individuals can create their own test endpoints in Zapier

Note: Because of permissions and security constraints, this probably needs to be done by @pydanny or @audreyfeldroy.