Add email samples into the User Guide and link to them

[awwaiid]

Summary

We send several different emails, let's give Bank Organizations previews!

Background references, notes

We send a variety of emails, including some that can be customized and ones that can be enable/disabled. For each of these it'd be good to show a sample of what this email will look like.

For each email we send:

• From the place where that email is configured or sent
• Link to the User Guide with a pre-created sample of what the email looks like
• If there is an enable/disable option, place the link near that option
• For example, when creating a partner we ask "Do you want this partner to receive emails for distributions and reminders from the system?". Add a link to the User Guide next to that which shows what the email will look like in general
• For each email, trigger the email in your development environment locally and copy/paste that into the User Guide
• Optional/Experimental: Write a script that generates a page (or pages) in the User Guide with the emails; consider triggering a PR-create process from a github action

Criteria for completion / testing needs

• Enumerate email sends
• For each email ensure the User Guide has a sample output of the email
• For each email link to the User Guide from where the email is configured or sent
• Add a request spec that verifies that the links work (are not dead)