core(graph): initial doc

[romintomasetti]

Summary

We are starting to document Kokkos::Experimental::Graph.

This PR sets the basement for it.

Joint work with @maartenarnst.

Drive-by change: ensure that the year corresponds to the moment the documentation was generated. (see #649)

Description

Some additional work was need to get graphviz working:

1. apt install the graphviz package
2. but the CI was running on a runner, not in a container, so I got permission denied
3. so I added container:
4. and pip was not found
5. so I ended up using the python:3.10 image.

Related

• extracted from core(graph): adding documentation for Kokkos::Experimental::Graph #565.

[romintomasetti]

As discussed with @dalg24, let's give the Kokkos::Graph a decent minimal amount of documentation.

@dalg24 @JBludau @crtrott Would you have some time to review this ?

[JBludau]

looks like a good starting point

[romintomasetti]

@dalg24 Would you mind taking a look ? 👓

[dalg24]

It is fine to add later but we also will need the API reference for it

[maartenarnst]

OK indeed!