update facet configuration docs

[atomczak]

No description provided.

[atomczak]

I'm trying to remove the TODOs from the docs, and among them found this:

⚠️TODO: in the documentation we will be explicit that traversing IfcRelDecomposition for the purpose of material evaluation will not be implemented in 1.0. We need to define what is the behaviour when it comes to the IfcRelDecomposition and the propagation of materials.

As far as I remember, IfcRelAggregates (a subclass of IfcRelDecomposes) is permitted and the checkers should traverse, for example, IfcBuildingElementPart. Am I wrong? @CBenghi, @andyward, @Moult, @pasi-paasiala
If not allowed in 1.0, I suggest to reconsider for 1.1

[atomczak]

@CBenghi, as agreed, I split the facet configuration doc into individual facets and merged with other docs.

[CBenghi]

Apologies, it's a bit of a busy week, @atomczak
I'll get to review this soon.

[andyward]

Couple of comments

[berlotti]

Well done