New examples

[atinux]

The goal of those examples is to illustrate parts of the Nuxt documentation and expose a demo for giving the best DX when learning.

Right now we keep our old examples in the examples/ directory which is fine but I want to slowly have new examples (might be naked with no CSS if it's about showcasing basic functionalities).

[atinux]

For now I am thinking:

1.hello-world/
2.pages-transition/
3.custom-page-transition/
4.layouts-transition/
5.dynamic-transitions/ 

[pi0]

One idea that now we are in a mono-repo, a top level .nuxtrc can enable example layout for all examples making them as bare as possible (can be done by nuxt/ui setting it on nuxt-root component). /cc @antfu

[atinux]

So far I would like to try the examples without any UI library to start :)