feat: BLACK HEART DANCE HOUSE landing page

Landing page with Hero, About, Team, Classes, and Contact sections.
Light/dark mode, scroll reveal animations, Yandex Maps, responsive design.
Next.js 16 + Tailwind v4 + TypeScript.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/components/sections/About.tsx

@@ -0,0 +1,25 @@
+import { siteContent } from "@/data/content";
+import { SectionHeading } from "@/components/ui/SectionHeading";
+import { Reveal } from "@/components/ui/Reveal";
+
+export function About() {
+  const { about } = siteContent;
+
+  return (
+    <section id="about" className="surface-muted section-padding">
+      <div className="section-container">
+        <Reveal>
+          <SectionHeading>{about.title}</SectionHeading>
+        </Reveal>
+
+        <div className="mt-8 max-w-3xl space-y-4">
+          {about.paragraphs.map((text, i) => (
+            <Reveal key={i}>
+              <p className="body-text text-lg leading-relaxed">{text}</p>
+            </Reveal>
+          ))}
+        </div>
+      </div>
+    </section>
+  );
+}