feat: use server-actions for authoring flow

This change actually makes the authoring flow work for
the most part by tying in emailing and more.

We have also done a number of quality of life updates to
simplify the codebase overall making it easier to continue
work on the refresh.

packages/email/templates/document-pending.tsx

@@ -1,6 +1,5 @@
 import {
   Body,
-  Button,
   Container,
   Head,
   Html,