Implement Email Service

[IvanA673]

Description
The task for this issue is to implement the nodemailer emailing service. An email should be sent out to the prospect(s) once the ReferralForm is submitted. Also, implement the styling for the email to be as close as you can to the design that can be found on Figma.

Acceptance Criteria

• Created a handler that will handle sending out an email to a prospect. This handler will be called on submission of the ReferralForm and should send out an email to all intended prospects.
• The handler is tested (include screenshots of tests you conducted within your pull request)
• Style the email that is sent to the prospects to match the Figma design