Add the ability to send email confirmations via SendGrid
The existing partial implementation of email confirmations uses nodemailer, which we've been having issues with. Therefore, we are going to use sendgrid moving forward as recommended by the H4I board.

• Create an account on SendGrid
• Set up the required keys and complete other requisite steps to use sendgrid. Add them to the .env
• Modify the functions in emailRoutes.js to use sendgrid functions

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