User story: as a facilitator, I want to ensure emails sent to hpc-announce have consistent configuration

• Problem: Sending emails to hpc-announce is error prone and difficult to keep consistent.
• Request: Help us improve consistency of emails sent via hpc-announce (and other email lists).

Minimal Features

An opinionated command line tool with the following features:

1. Pre-configured headers
   • From: rc@uab.edu (or another generic, group-wide email address)
   • Reply-to: support@listserv.uab.edu (or whatever is appropriate for the target)
2. Pre-configured style elements
   • Salutation: "To our Research Computing Community,\n\n"
   • Closing: "Thank you for reading,\n\n"
   • Signature with professional, branded appearance, helpful links, etc.
3. Pre-configured credentials for sending email address
4. Simple UX: email hpc-announce body.txt or .html

Nice-to-have Features

• Optional input for salutation/closing, to handle special cases
• Dry-run: Output formatted email to txt/html file for review
• Dry-run: Send the formatted email to a specific address to test the full process
• Specialized configurations for each target, with a unified default. Anything not specialized uses the default. So, for example, we can specialize the signature for hpc-announce differently than for a newsletter.