Send email to `scc@frontseat.org` when new content appears

[davepeck]

I'll set up scc@frontseat.org as a mailing list that sends onward to us.

Any time we either:

1. Add a new Meeting to the calendar
2. Move a meeting from having no summarized content to having some summarized content

We send an email to scc@frontseat.org.

The email should:

• Contain both the GPT-3.5 summarized headline and body text
• Contain the meeting time, place, location, and SCC body
• Contain a link to the scc.frontseat.org page for the meeting
• Contain a link to the legistar page for the meeting