style: Redesign error page and remove API docs from footer

Convert error page to neon esports aesthetic with gold theme for
warning states, animated flash icon, and proper button semantics.
Remove API Docs link from footer navigation.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/lib/components/layout/Footer.svelte

@@ -7,8 +7,7 @@
 		main: [
 			{ name: 'Home', href: '/' },
 			{ name: 'Matches', href: '/matches' },
-			{ name: 'Players', href: '/players' },
-			{ name: 'API Docs', href: '/docs/api' }
+			{ name: 'Players', href: '/players' }
 		],
 		about: [
 			{ name: 'About', href: '/about' },