Fix shuffle dropping a past contributor on every page load

The Fisher-Yates shuffle in the past-contributors section redistributed
cards at a hardcoded 3-per-row across 2 rows, giving 6 slots for 7 cards
and silently dropping whichever card landed at index 6. Laurent Soucasse
was already in the source but vanished about 1-in-7 page loads (the same
held for any of the other 6 cards).

Compute per-row capacity as ceil(totalCards / numRows) so all cards
always render. Bootstrap .col-lg-4 wraps a 4th column onto a second
visual line within the same .row, so the layout stays clean.

Author: timlichtenberg

_includes/components/teams/team-carousel-2.html

@@ -1337,10 +1337,13 @@ <h6 class="mb-1">Numerical methods</h6>
       }
     });
 
-    // Redistribute shuffled cards (3 per row)
+    // Redistribute shuffled cards across the available rows, scaling per-row
+    // capacity to the actual card count so no card is ever dropped. Bootstrap
+    // .col-lg-4 wraps a 4th card to a second visual line within the same .row.
+    const perRow = Math.ceil(allCards.length / cardRows.length);
     let cardIndex = 0;
     cardRows.forEach(row => {
-      for (let i = 0; i < 3 && cardIndex < allCards.length; i++) {
+      for (let i = 0; i < perRow && cardIndex < allCards.length; i++) {
         row.appendChild(allCards[cardIndex]);
         cardIndex++;
       }