Replace n4o-collections.csv

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With databases managed bei LEIZA. See nfdi4objects/n4o-databases#3 for more data also to be moved to / replaced by this database / knowledge graph.

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In lack of a usable knowledge graph from LEIZA, better move n4o-collections.csv into n4o-databases.

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We should move to a JSON formt that includes downloadURL and information about format (RDF or LIDO) for each collection. This format could be generated or used by extractors.