Lay sections out in a multi-column flow instead of one long column

pf.sh's rule listing made the page noticeably taller without using any
of the available width. Wrap each section in a .section block and the
whole set in a .cols container using CSS multi-column layout
(column-width: 380px) - sections flow left-to-right/top-to-bottom
across however many columns fit the window, each staying intact
(break-inside: avoid) rather than splitting a table mid-page.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

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