Bring every text colour up to WCAG AA

Muted, faint, the footer and the month and year ages fell short of
4.5:1 on the backgrounds they sit on, the row stripes and line number
cells among them, and links inside sentences differed from the text
around them only by colour. Each grey is now the lightest that clears
4.5:1 on its darkest background, with months stepped between weeks and
years so the age fade keeps all six steps, and links in running text
are underlined.

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