Migrate from EmailJS to Nodemailer

[wllmwu]

Administrative Info

[GitHub Issue #] Make sure your branch name conforms to: <feature/staging/hotfix/...>/[username]/[3-4 word description separated by dashes]. Otherwise, please rename your branch and create a new PR.

Changes

What changes did you make?

• Install nodemailer in root, remove emailjs-com from client
• Add new API routes:
  • POST /email/registerOrg - send an email to the admin email address to notify about new org signup
  • POST /email/addUser - send an email to the newly added user containing a password reset link
• Call those routes from the frontend upon successfully registering org/adding user
• Closes #72

Testing

How did you confirm your changes worked?

• Tested registering an org and adding a user - received emails correctly in both cases

Confirmation of Change

Upload a screenshot, if possible. Otherwise, please provide instructions on how to see the change.

• Register a new org and sign in to the tsemoneta@gmail.com email account to see the first type of email
• Add a new user with your email address in the tse@ucsd.edu account (in Moneta) to see the second type of email

[wllmwu]

Notes @navidboloorian

• Currently we are able to use Gmail addresses as senders by enabling the "Less secure apps" option in the Google account settings (I did this already for tsemoneta@gmail.com). However, this option will be removed on May 30. To keep using the Gmail account, we will need to use OAuth2 with Nodemailer (documentation here).
• If email sending fails, the frontend displays a message saying to contact us.

If you think either of these should change, let me know and I'll address them!