Customize app root element

[yassilah]

Describe the feature

Currently, the Nuxt app is mounted inside a #__nuxt container and this cannot be changed. Allowing for a custom root element would allow for:

• customizing the rendered HTML page using a Nitro plugin and mount the app inside that custom page;
• creating a no-SSR app and incorporating it into an existing HTML page, but with all the benefits that Nuxt brings along.

Additional information

• Would you be willing to help implement this feature?
• Could this feature be implemented as a module?

Final checks

• Read the contribution guide.
• Check existing discussions and issues.

[manniL]

Also related: #15132

[yassilah]

Thanks, i'll mention the issue in the PR. Have you taken a look at it?