Update README.md

Link to nuget package from the badge, link to stable docs now that those exist

Author: drewcassidy

README.md

@@ -3,8 +3,8 @@ KSP Build Tools
 
 [![Documentation Status](https://readthedocs.org/projects/kspbuildtools/badge/?version=latest)](https://kspbuildtools.readthedocs.io/en/latest/?badge=latest)
 [![CI](https://github.com/KSPModdingLibs/KSPBuildTools/actions/workflows/internal-ci.yml/badge.svg)](https://github.com/KSPModdingLibs/KSPBuildTools/actions/workflows/internal-ci.yml)
-![NuGet Version](https://img.shields.io/nuget/vpre/KSPBuildTools)
+[![NuGet Version](https://img.shields.io/nuget/vpre/KSPBuildTools)](https://www.nuget.org/packages/KSPBuildTools)
 
 This repository aims to provide a common set of tools for developing mods for Kerbal Space Program. Note that it's still in "alpha" stages so expect things to change or break.
 
-[Full Documentation](https://kspbuildtools.readthedocs.io/en/latest/)
+[Full Documentation](https://kspbuildtools.readthedocs.io/en/)