I've been the primary content devevloper assigned to the NuGet docs since last September, and we're delighted today that we've migrated the doc set to docs.microsoft.com, a site where many other doc sets are being consolidated. A few more details are here: http://blog.nuget.org/20170112/nuget-docs-move-to-msftdocs.html!

NuGet, if you don't know, is the package manager for .NET technologies, with the public gallery on http://www.nuget.org.