add npj precision oncology citation for wsinfer

[kaczmarj]

with the proposed changes, the wsinfer documentation looks like this:

[petebankhead]

Can you remove the duplication of the DOI? I think just drop the first one, and make the second a clickable link.

[petebankhead]

I also changed it to try to merge into the 0.5 branch so that it turns up in the stable docs.

[kaczmarj]

made the changes. here is what citation box looks like now