Docs examples ref

[timotheeguerin]

As of pr #3860 we combine our examples in the website. However in some guides/how to we might want to show case one of those examples inline.

It would be good to add an astro component so you could do

<ExampleRef path="arm/foo/bar"/>

List of examples to fix

[markcowl]

@timotheeguerin assign to copilot after the other issue is merged