npx is still using v4

[kissu]

I've tried to create a new Nuxt app by using

npx create-nuxt-app my-cool-project --edge

but it wasn't using the v5, still the v4 (maybe it's a desired behavior? 🤔).

The variants with NPM and yarn work well tho (using the v5).

PS: I found that the breaking change of needing Node v14 is confusing for newcomers, we should probably write that into the README.md and add that as a warning like for Nuxt3.