Marketing: trackers deferred, critical CSS inlined, CLS and a11y fixed

The marketing site got a perf and accessibility pass that mirrors the admin and portal work but with one extra: the critical CSS for the first viewport is now inlined into the document head instead of loading via a separate stylesheet.

The result is a much faster first paint on cold visits — the hero renders without waiting on a single network round trip. Several accessibility issues (contrast, focus visibility, missing landmark) were closed out at the same time.