Remove unused file in model

hyrax/app/models/concerns/datacite_metadata.rb

-module DataciteMetadata
-  property :doi, predicate: ::RDF::Vocab::DataCite.doi, multiple: false do |index|
-    index.as :symbol
-  end
-
-  property :complex_person, predicate: ::RDF::Vocab::SIOC.has_creator, class_name:"ComplexPerson"
-
-  # property :date_published, predicate: ::RDF::Vocab::Rdms.datePublished, multiple: false do |index|
-  #   index.type :date
-  #   index.as :stored_sortable
-  # end
-
-  property :complex_date, predicate: ::RDF::Vocab::DC.date, class_name:"ComplexDate"
-
-  property :complex_identifier, predicate: ::RDF::Vocab::Rdms.identifier, class_name:"ComplexIdentifier"
-
-  # Geolocation - would this be used? Ignoring for now.
-
-  property :complex_funding_reference, predicate: ::RDF::Vocab::DataCite.fundref, class_name:"ComplexFundingReference"
-
-  property :complex_relation, predicate: ::RDF::Vocab::DC.relation, class_name:"ComplexRelation"
-
-  include ComplexValidation
-  accepts_nested_attributes_for :complex_person, reject_if: :person_blank, allow_destroy: true
-  accepts_nested_attributes_for :complex_date, reject_if: :date_blank, allow_destroy: true
-  accepts_nested_attributes_for :complex_identifier, reject_if: :identifier_blank, allow_destroy: true
-  accepts_nested_attributes_for :complex_funding_reference, reject_if: :fundref_blank, allow_destroy: true
-  accepts_nested_attributes_for :complex_relation, reject_if: :relation_blank, allow_destroy: true
-end
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