Bug - Bad link to GA4GH Pedigree IG

### Describe the bug
[Family Module overview](https://nih-ncpi.github.io/ncpi-fhir-ig-2/module_family.html) includes a link to the Pedigree IG that goes to the GitHub [https://github.com/ga4gh/pedigree-fhir-ig](https://github.com/ga4gh/pedigree-fhir-ig) rather than the IG itself. The correct link to the IG is [https://ga4gh.github.io/pedigree-fhir-ig/](https://ga4gh.github.io/pedigree-fhir-ig/)
