feat: upgrade example to nuxt3, nuxt-sanity and tailwindcss

[stipsan]

• Studio deployment
• Nuxt3 deployment
• Old nuxt2 deployment (for comparison purposes)

Studio changes

• Updated demo data (includes favicon and fixes to some portable text fields containing broken references)
• Enable studio hints (from #21)
• Added sanity-codegen as it's used to generate the web/types/schema.ts defs.
• Added @sanity/vision to ease GROQ debugging.
• Added favicon to eventInformation schema, making it easy to change.
• Fixed a bug in the isSameDay check in schemas/objects/schedule, that caused it to create false negatives thinking it's not the same day when it is in fact the same day.

Web/frontend changes

• Migrated to Nuxt 3.
• Refactored all components from <script> syntax, to <script setup> which supports Suspense.
• Used <script lang="ts"> and changed the overall codebase to make use of as much TypeScript as possible.
• Moved all data fetching to nuxt/sanity
• Refactored CSS to TailwindCSS.

[stipsan]

• I'll update the template 👍
• Yeah since we already have a Vue starter that is more focused on the basics I thought it made sense to use tailwind and TS on Nuxt3 with codegen. Especially since @nuxt/sanity, @nuxt/tailwind' and@nuxt/typescript` all have first class support in the Nuxt community it's great to have something that demonstrates how you can put all those pieces together 😌