Update to 13.0.0-rc1

Author: ronaldbarendse

Directory.Packages.props

@@ -10,7 +10,7 @@
     <GlobalPackageReference Include="Umbraco.GitVersioning.Extensions" Version="0.2.0" />
   </ItemGroup>
   <PropertyGroup>
-    <UmbracoCmsPackageVersion>[12.0.0, 13)</UmbracoCmsPackageVersion>
+    <UmbracoCmsPackageVersion>[13.0.0-rc1, 14)</UmbracoCmsPackageVersion>
   </PropertyGroup>
   <ItemGroup>
     <PackageVersion Include="Umbraco.StorageProviders.AzureBlob" Version="$(UmbracoCmsPackageVersion)" />

NuGet.config

@@ -3,25 +3,5 @@
   <packageSources>
     <clear />
     <add key="nuget.org" value="https://api.nuget.org/v3/index.json" />
-    <add key="Umbraco Prereleases" value="https://www.myget.org/F/umbracoprereleases/api/v3/index.json" />
-    <add key="Umbraco Nightly" value="https://www.myget.org/F/umbraconightly/api/v3/index.json" />
   </packageSources>
-  <packageSourceMapping>
-    <packageSource key="nuget.org">
-      <package pattern="Umbraco.Cms.*" />
-      <package pattern="Umbraco.StorageProviders" />
-      <package pattern="Umbraco.StorageProviders.*" />
-      <package pattern="*" />
-    </packageSource>
-    <packageSource key="Umbraco Prereleases">
-      <package pattern="Umbraco.Cms.*" />
-      <package pattern="Umbraco.StorageProviders" />
-      <package pattern="Umbraco.StorageProviders.*" />
-    </packageSource>
-    <packageSource key="Umbraco Nightly">
-      <package pattern="Umbraco.Cms.*" />
-      <package pattern="Umbraco.StorageProviders" />
-      <package pattern="Umbraco.StorageProviders.*" />
-    </packageSource>
-  </packageSourceMapping>
 </configuration>