v4.20.0: Support Linked Image Cards, Offer Transparent Sections

What's Changed

• deps: core-styles v2.37.0 by @wesleyboar in cbfcf1c
• enhance: transparent/margin section via Container by @wesleyboar in #891
• fix: importHTML.replaceFromURL can return null by @wesleyboar in #892

Full Changelog: v4.19.1...v4.20.0