Docbuild can't find intersphinx inventory

```
WARNING: failed to reach any of the inventories with the following issues:
intersphinx inventory 'https://richford.github.io/groupyr/objects.inv' not fetchable due to <class 'requests.exceptions.HTTPError'>: 404 Client Error: Not Found for url: https://richiehalford.org/groupyr/objects.inv
```