Add release notes for Djblets 5.3.
Review Request #14759 — Created Jan. 5, 2026 and updated — Latest diff uploaded
Djblets 5.3 is a large release, featureing caching improvements, new
dynamic page state injection support, general rate limiting, cache
locks, layered siteconfig lookups, new templatetag support, and a whole
lot more.This change introduces the release notes for this release, covering
usage information and examples where appropriate.
Built the docs. Checked for bad links, build errors, and any obvious
errors in the text.