Fix information about ontologies
-The project defines two ontologies. The 'official' ontology URLs are http://purl.org/ URLs that redirect to the latest release of the respective ontology.
-* [https://w3id.org/won/core](https://w3id.org/won/core) - points to the latest release of this file: [/webofneeds/won-vocab/src/main/resources/ontology/won_ontology_v1.0.ttl](/webofneeds/won-vocab/src/main/resources/ontology/won_ontology_v1.0.ttl). This ontology is used to describe WoN nodes, Atoms, and Connections
-* [https://w3id.org/won/message](https://w3id.org/won/message) - points to the latest release of this file: [/webofneeds/won-vocab/src/main/resources/ontology/won_message_ontology_v1.0.ttl](/webofneeds/won-vocab/src/main/resources/ontology/won_message_ontology_v1.0.ttl). This ontology is used for specifying messages.
+The project defines a number of ontologies, available in the URI space below https://w3id.org/won/.
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+* [https://w3id.org/won/core](https://w3id.org/won/core) - This ontology is used to describe WoN nodes, Atoms, and Connections
+* [https://w3id.org/won/message](https://w3id.org/won/message) - This ontology is used for specifying messages.
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+The ontology URIs redirect to the latest release of the respective ontology. All ontologies are hosted in the [GitHub page of this repository](http://researchstudio-sat.github.io/webofneeds/) - (the `gh-pages` branch), their sources are in the [won-vocab module of this projct](/webofneeds/won-vocab).
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