Hall Monitor sends emails on Failure

[BryceStevenWilley]

Lets Hall Monitor send email notifications to multiple, comma separated emails, through sendgrid. Works great, and gives you a direct link to see if the server is still down, or it was just a blip (which can occasionally happen).

Some links that I used when making this:

• https://stackoverflow.com/questions/62304258/github-actions-notifications-on-workflow-failure
• https://docs.sendgrid.com/for-developers/sending-email/quickstart-python
• https://docs.sendgrid.com/api-reference/mail-send/mail-send
• https://docs.sendgrid.com/for-developers/sending-email/v3-python-code-example