fix(compat): add a note about Nuxt Bridge for Nuxt.js users

[superbiche]

Description of Problem

The current piece of advice for Nuxt.js users (https://v3.vuejs.org/guide/migration/migration-build.html#intended-use-cases) is currently:

Server-side rendering: [...] If you are using Nuxt.js, it is probably better to wait for Nuxt 3.

Nevertheless, Nuxt Bridge can be a great alternative, and a nice way to see how much of a codebase will have to be updated to run Nuxt 3.

There's also no link to Nuxt 3, and the fact that it is now in beta phase is not mentioned. I think it would be helpful to give more information about it right the docs.

Proposed Solution

• Add information + link to Nuxt Bridge "Getting Started" guide
• Add link to Nuxt.js 3 "Getting Started" guide + a note to inform readers that it is currently in beta.

Additional Information

I guess someone should add a reminder to update the docs again when Nuxt.js 3 gets a first stable release - it seems overkill to get the version during Vue docs build. I'll try to remember doing this!

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[NataliaTepluhina]

@superbiche thank you, that's a nice addition 🙇🏻