docs: Rework ontology docs generation entirely
Ontology docs weren't in a much good shape, besides many ontologies being seriously underdocumented (something which should improve separately), the generated docs were little more than a data dump, and the diagrams shown were broken, confusing, or both. This all amounts to quite counter-productive developer docs. So the ontology docs have been refurbished, the per-ontology descriptions are still useful, but have been stripped of all images, and the docs overall are now completely class-centric, per rdfs:Resource subclass we now get: - Ascii diagram of its local hierarchy, up to all its ancestors and down to all its direct children. - All properties that affect the specific class. This is notably more intuitive now as there's properties defined on one ontology that are in the domain of classes in another ontology, something which you couldn't get at a glance in the previous docs - It clearly states which properties supersede which superproperties, which again makes it easier if those apply for the class at hand. The result feels quite neater, and will indeed be more resembling to other gtk-doc generated API docs.
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