[Sync to prerelease] Reserve the red announcement banner for prerelease and fix its contrast - #2277

[Sync to prerelease] Reserve the red announcement banner for prerelease and fix its contrast#2277

cwickham merged 1 commit into

prereleasequarto-dev/quarto-web:prereleasefrom

sync-2276-to-prereleasequarto-dev/quarto-web:sync-2276-to-prereleaseCopy head branch name to clipboard