Merge pull request #772 from melMass/develop

fix: ⚡️ nuget avalonia url

Author: danwalmsley

Diff for: nuget.config

@@ -3,7 +3,7 @@
   <packageSources>
     <clear/>
     <add key="nuget.org" value="https://www.nuget.org/api/v2/" />
-    <add key="avalonia-all" value="https://nuget.avaloniaui.net/repository/avalonia-all/" />
+    <add key="avalonia-all" value="https://nuget.avaloniaui.net/repository/avalonia-all/index.json" />
     <add key="XamlBehaviors" value="https://www.myget.org/F/xamlbehaviors-nightly/api/v2" />
     <add key="sharpgen" value="https://www.myget.org/F/sharpgentools/api/v3/index.json" />
     <add key="cli-deps" value="https://dotnetfeed.blob.core.windows.net/dotnet-core/index.json" />