authoring_intro dark:Snapshot #1

Build 790 on codex/next-markdown-exports
Reviewing disabled
Baseline History
Build 790072321c
Current build. There are unaccepted changes, so build 749 is still the baseline.
Build 7356a5950a
Auto-accepted
Build 689d046916
Auto-accepted
Build 6753ada04f
Auto-accepted
Commenting is disabled because there's a newer build on this branch