Add SendGrid to Deployment

[ChaelCodes]

Description of Feature or Issue

closes #217

We need SendGrid to handle email confirmation during account creation, and it'll be used to send emails out notifying users before an event.

The plan for the webservice was upgraded to starter, so that's been reflected in the render.yml as well.

Checklist

• [x] Added/changed specs for the changes made
• [x] Is the linting build successful?
• [x] Is the test build successful?

[ChaelCodes]

Confirmed that one confirmation email was sent, but it has not been received by gmail yet.