refs and cleanup

Author: SimonCropp

src/Directory.Packages.props

@@ -5,7 +5,7 @@
   </PropertyGroup>
   <ItemGroup>
     <PackageVersion Include="DocumentFormat.OpenXml" Version="3.3.0" />
-    <PackageVersion Include="MarkdownSnippets.MsBuild" Version="27.0.2" />
+    <PackageVersion Include="MarkdownSnippets.MsBuild" Version="28.0.0-beta.1" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.13.0" />
     <PackageVersion Include="NodaTime" Version="3.2.2" />
     <PackageVersion Include="NUnit" Version="4.3.2" />