Add handlebars to send the emails

@hagopj13

During the review I found important thing missing related with sending emails. Right now boilerplate allowed to send the email with string which we need to update manually. I like to add feature to send the emails using handlebars.

If you think above idea is good then I can start implementing this feature. Happy to discuss more on this if it make sense.

Thanks,
JD

Review the repository's current email-sending implementation first; the issue does not identify a file, entry point, or test. Clarify the intended Handlebars integration and define completion as supporting email templates without manually updating embedded strings.

Written by the indexing model from the issue text.