fix clingen datamodel broken links in wiki & ontobee pages please

[larrybabb]

@mbrush FYI - the links you are using in the wiki and ontobee entrees (geno for example) to reference the clingen models are old and not working (sorry - we weren't able to reroute them on our side).

Anyway please change all datamodel.clinicalgenome.org references to dataexchange.clinicalgenome.org. Here's an example of a broken link, the first reference in the top paragraph of this page in the SEPIO wiki https://github.com/monarch-initiative/SEPIO-ontology/wiki/ClinGen-ACMG-Variant-Interpretation

and here's an example of an old/broken link in geno http://www.ontobee.org/ontology/GENO?iri=http%3A%2F%2Fpurl.obolibrary.org%2Fobo%2FGENO_0000890 (several throughout the annotation section).