--mf-hero-bg/--mf-spotlight-bg's overlay tint was at 16% alpha, which
after the pastel lightness/chroma boost read as a fairly solid block
of color rather than a soft wash. Halve it to 8% so more of the plain
page background shows through underneath.
Keep the secondary button's color-mix ratio (in layout.css) in sync at
8% too, since it's built to replicate exactly what the surface behind
it looks like.
Admin
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