?
I understand... you want the ProGet web server to host/serve the icon files themselves...
It's very unlikely we will implement an image/file hosting feature. There are plenty of image/file hosting servers out there, or you could just use a basic IIS site to serve files from disk.
Note that, on the NuGet roadmap, there is a feature to store icons in the package, like ProGet's universal packages does, using package://myicon.png; this would simplify things quite a bit.