Two main enhancements:

1. Setup Ethereal Email for running on local environments. Docs: https://www.nodemailer.com/smtp/testing/ (Devops)

2. Change to OAuth2 for more secure connection instead of gmail app passwords approach. Docs: https://www.nodemailer.com/smtp/oauth2/ (Development)

Branch: https://github.com/karabil/Scheduler-web/tree/SW-38