feat: add real content from Notion page

Fill in team members, classes, contact info, and Yandex Maps with
actual data from the BLACK HEART DANCE HOUSE Notion page.

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

src/components/sections/Classes.tsx

@@ -1,4 +1,4 @@
-import { Flame, Sparkles, Wind, Music } from "lucide-react";
+import { Flame, Sparkles, Wind, Zap, Star, Monitor } from "lucide-react";
 import { siteContent } from "@/data/content";
 import { SectionHeading } from "@/components/ui/SectionHeading";
 import { Reveal } from "@/components/ui/Reveal";
@@ -7,7 +7,9 @@ const iconMap: Record<string, React.ReactNode> = {
   flame: <Flame size={32} />,
   sparkles: <Sparkles size={32} />,
   wind: <Wind size={32} />,
-  music: <Music size={32} />,
+  zap: <Zap size={32} />,
+  star: <Star size={32} />,
+  monitor: <Monitor size={32} />,
 };
 
 export function Classes() {