"Nail" portraits to the page

- Fixup #photos height: no sense using viewport units when the header
  and the footer can grow big enough to overlap on this absolute
  length.

- Fixup #photos img height: with the above fix to #photos, 100% of a
  grid element now takes roughly half the div, modulo padding.

- Displace portraits symmetrically around the grid's center; this
  helps maintain the fourth portrait high enough that it does not go
  below the div.

Otherwise, when the portrait *does* get below the div, Firefox
glitches: it shows a scrollbar, presumably to allow me to see the rest
of the portrait, except that for some reason (#photos's sticky
position? 🤷), scrolling never happens, and I can scroll infinitely
downward.

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