docs: add Nuxt 3 static files location (#5989)
docs: add Nuxt 3 static files location (#5989)

The Nuxt 2 `static` directory became the `public` directory on Nuxt 3, as described
on the official docs: https://v3.nuxtjs.org/docs/directory-structure/public

This PR updates the `add-to-your-site` docs so both Nuxt 2 and 3 are covered
on the App File Structure table
netlify/netlify-cms,netlify/netlify-cms,netlify/netlify-cms,netlify/netlify-cms