Create PURLS urls for all the variants and formats in the ontology
We need to generate valid PURL urls for the ontology's variants and formats:
- chebi.json
- chebi-lite.owl
- chebi-lite.json
- chebi-lite.obo
- chebi-core.owl
- chebi-core.json
- chebi-core.obo
We should check the purl.obolibrary.org repository and ask advice in the obo community to perform this task