Added

• Plugin banner and icon (props @lea10up via #17).
• GitHub Actions for WordPress.org plugin deploy and readme/asset update (props @jeffpaul, @ChrisHardie via #18, #20, #25, #34).

Changed

• Bump WordPress version "tested up to" 5.6 (props @ChrisHardie via #11, #12, #15, #16, #19, #32).
• Documentation updates (props @jeffpaul via #14, #28).