fix(school): drop the nearby section's lede, which repeated its heading

"Other schools nearby" was followed by "Other primary schools near
<school>.", which says the same thing again. The heading now stands alone.

nearbyNoun() and the phase and schoolName props existed only to build that
line, so they go with it. Its bottom margin was the only gap between the
heading and the cards, so the header row carries that gap now, and centres
the heading against the carousel arrows now that it is a single line.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

nextjs-app/components/school/NearbySchoolsCarousel.tsx

@@ -4,7 +4,7 @@
  * The scroller and its arrows.
  *
  * `children` are the server-rendered cards and `header` the server-rendered
- * heading and lede: both stay server components, passed through, so this file
+ * heading: both stay server components, passed through, so this file
  * owns a DOM ref and nothing else. That is what keeps all six links in the
  * initial HTML — a carousel that mounted cards on click would put four of the
  * six beyond a crawler and beyond a reader with no JavaScript.