Add release notes for Review Board 4.0.
Review Request #11606 — Created May 14, 2021 and submitted
This covers all the features, improvements, and fixes that went into
Review Board 4.0, along with installation instructions, upgrade notes,
and comaptibility changes.
It's a big release with a lot to cover. The focus on the release notes
was to discuss the installation-related topics first, and to follow that
up with all the new feature changes, followed by bug fixes.
Built the docs. Checked for build errors, link errors, and spelling
Updated with the new Markdown URL protocol change and the Subversion deleted file fix.
Revision 2 (+1368 -4)
Checks run (2 succeeded)