Indeed, the silent value was missing, which was blocking luciole

add a  test sin the CI  to make sure I  don't miss simca break  in the
future ! (I was only testing simca using the docker version of sasa).

and remove the useless node_modules directory

also, use (back) the odoc make rule now the image has been updated

Because currently, the docker image that  builds the pages via the CI
can not run odoc as it require a more recent dune version. It is because
this image used opam 1

using opam 2 would fix this. will do latter

To do that, I've reorganized the code

Test: with ocaml 4.08, it is impossible to load the same function twice.
Hence the need to define p.mli files for graphs with several nodes.

Also, track missing files and the alea-coloring exemples.