Nuxt integration doc sucks

### Environment

SaaS (https://sentry.io/)

### What are you trying to accomplish?

Hey there. Sorry for the title, but I'm updating sentry for the last few days, and I have to confess you doc for nuxt integration litterally sucks. Sometime you're using config files, sometimes inline config, sometimes through key A, sometimes B...

This is inconsistent and poorly documented.

### How are you getting stuck?

N/A

### Where in the product are you?

Unknown

### Link

_No response_

### DSN

_No response_

### Version

_No response_

Review the Nuxt integration documentation and compare its configuration examples, focusing on the inconsistent use of config files, inline configuration, and different keys described in the issue. The work is done when the supported configuration approach is consistent and the Nuxt setup is documented clearly.

Written by the indexing model from the issue text.