Broken links in readme

[ghylander]

All links in the readme to "nrel.github" are (understandably) broken
I tested changing the urls to nlr.github but they are likewise broken as well

[dzalkind]

Thanks for catching this. We can update it in a coming PR.

In the meantime, here is a correct link: https://natlabrockies.github.io/WETOStack/