Move to nuxt3

[MrSunshyne]

Motivation

• The website is moving towards interactive elements more and more and using Astro islands has become quite annoying.
• Our dynamic components are already in vue.
• There has been no contribution from community members in other languages(react/svelte/solid).
• Want to move to Cloudflare and nuxt offers first-party integration with CF
• Want to adopt radix-vue for interactive parts( profile / rsvp / event info )

Extras

• Build a nuxt-3 repo that can gather all best practices and be reference for nuxt3 patterns. While at the same time being a real project for the frontend.mu community not just a 'demo'
• Get better at nuxt and contribute upstream

The migration should happen after moving to a monorepo structure and it should exist in packages/frontend.mu-nuxt3