Update hub-config.md

[mmkerr]

Address issue number #64 (https://github.com/Infectious-Disease-Modeling-Hubs/hubDocs/issues/64).

[bsweger]

Your changes look good @mmkerr. I'm a little curious that the README for this repo states:

Note that PRs should trigger preview builds of the site, so you should be able to double-check that your changes look as expected.

And I didn't see anything preview-related on the PR. That said, I checked the updates by cloning your fork and building the site on my laptop.

I also saw that the links to our latest hubverse schema are broken 😱 (which is not related to your changes, pretty sure I did that--will create an issue), so thanks for inadvertently surfacing that problem!

[nickreich]

The link to the preview is there, under the "Details" link shown in the bottom right below:

[bsweger]

This is what I see (no preview) 🤔