docs: add ssgoi - page transition library with mobile-first optimizations

[Moon-DaeSeung]

Summary

• Add ssgoi to Animation section

Why ssgoi deserves a spot here

SSGOI brings native app-like page transitions to Vue/Nuxt web apps, specifically designed for mobile web app scenarios:

Mobile-First Optimizations

• 60fps guaranteed on low-end mobile devices - Spring physics engine + Web Animations API ensures butter-smooth animations even on budget phones
• Universal browser support - Works on Chrome, Firefox, Safari, Edge (not limited to Chrome's View Transition API)
• SSR/SSG ready - Full Nuxt compatibility without hydration issues

Built-in Mobile Patterns

• Drill transitions - Native iOS/Android-style depth navigation (list → detail)
• Shared element animations - Pinterest/Instagram-style image expansion
• State preservation - Maintains scroll position and app state across navigations

Perfect for Wrapped Web Apps

If you're building a mobile web app wrapped with Capacitor, Ionic, or any webview-based solution, ssgoi makes your transitions feel like a premium native app rather than a sluggish web page.

📚 Documentation & Nuxt Tutorial

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