This is a large release, moving onto modern architecture, and

introducing many new features for reviewers and administrators. This

includes Stale Ship-It! indicators, Trojan Source detection, Single

Sign-On, and more.
This change adds release notes covering all the public changes we want

to advertise for the release.
This lacks screenshots, but the plan is to add them in a follow-up

change.

Built the release notes. Checked for spelling errors, bad links, and

build errors.