docs(installation): add note about not registering bundled modules

Resolves #6332

Author: benjamincanac

docs/content/docs/1.getting-started/2.installation/1.nuxt.md

@@ -49,6 +49,10 @@ export default defineNuxtConfig({
 })
 ```
 
+::note
+There is no need to add `@nuxt/icon`, `@nuxt/fonts` or `@nuxtjs/color-mode` to your `modules` array as Nuxt UI registers them automatically. You can still configure these modules in your `nuxt.config.ts` using the `icon`, `fonts` and `colorMode` keys.
+::
+
 #### Import Tailwind CSS and Nuxt UI in your CSS
 
 ::code-group