Add release notes for Review Board 4.0.

Review Request #11606 — Created May 14, 2021 and submitted — Latest diff uploaded

Information

Review Board
release-4.0.x

Reviewers

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
errors.

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