chore: update NuGet default push source and remove WaMS feed

<?xml version="1.0" encoding="utf-8"?>

<configuration>

  <config>

    <add key="defaultPushSource" value="https://nuget.aae.wisc.edu" />

    <add key="defaultPushSource" value="https://nuget.cals.wisc.edu" />

  </config>

  <packageSources>

    <add key="NuGet official package source" value="https://api.nuget.org/v3/index.json" />

    <add key="CALS NuGet" value="https://nuget.cals.wisc.edu/api/v2" />

    <add key="WaMS" value="https://wams.doit.wisc.edu:443/nuget/nuget" />

  </packageSources>

  <!-- Used to store credentials -->