The main  core files should point to the latest version

The files under `https://ontology.bonsai.uno/core/`

are 

```
ontology_v0.1.rdf                                
ontology_v0.1.ttl                                 
ontology_v0.2.rdf                               
ontology_v0.2.ttl   
```

Maybe if we request 
`https://ontology.bonsai.uno/core/ontology.ttl`
we should point to the latest `ontology_v0.2.ttl`  instead of `404`


