Cleanup code signing configuration

Directory.Build.props

@@ -14,9 +14,6 @@
     <RepositoryRoot>$(MSBuildThisFileDirectory)</RepositoryRoot>
     <AssemblyOriginatorKeyFile>$(MSBuildThisFileDirectory)build\Key.snk</AssemblyOriginatorKeyFile>
     <SignAssembly>true</SignAssembly>
-    <AssemblySigningCertName>Microsoft</AssemblySigningCertName>
-    <PackageSigningCertName>MicrosoftNuGet</PackageSigningCertName>
-    <PublicSign Condition="'$(OS)' != 'Windows_NT'">true</PublicSign>
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
   </PropertyGroup>
 

build/PackSiteExtension.targets

@@ -12,8 +12,6 @@
       <RepositoryRoot>$(RepositoryRoot)</RepositoryRoot>
       <Category>shipoob</Category>
     </ArtifactInfo>
-    <FilesToSign Include="$(SiteExtensionOobArchive)" IsContainer="true" />
-    <FilesToSign Include="content/Microsoft.Web.Xdt.Extensions.dll" Container="$(SiteExtensionOobArchive)" Certificate="$(AssemblySigningCertName)" />
   </ItemGroup>
 
   <Target Name="PackSiteExtensionFiles"