"Revert unintended changes to main README"

Author: RichardChukwu

src/OpenTelemetry/OpenTelemetry.csproj

@@ -4,7 +4,6 @@
     <TargetFrameworks>$(TargetFrameworksForLibrariesExtended)</TargetFrameworks>
     <Description>OpenTelemetry .NET SDK</Description>
     <MinVerTagPrefix>core-</MinVerTagPrefix>
-    <IsPackable>true</IsPackable> <!-- Enable packaging for this project -->
   </PropertyGroup>
 
   <ItemGroup>
@@ -27,27 +26,10 @@
     <Compile Include="$(RepoRoot)\src\Shared\ThreadSafeRandom.cs" Link="Includes\ThreadSafeRandom.cs" />
   </ItemGroup>
 
-  <ItemGroup>
-    <None Include="README.md" Pack="true" PackagePath="" />
-    <None Include="RELEASENOTES.md" Pack="true" PackagePath="" />
-  </ItemGroup>
-
-  <PropertyGroup>
-    <PackageReadmeFile>README.md</PackageReadmeFile>
-    <PackageReleaseNotes>RELEASENOTES.md</PackageReleaseNotes>
-  </PropertyGroup>
-
-  <Target Name="UpdateReadmeLinks" BeforeTargets="Pack">
-    <ReadLinesFromFile File="README.md">
-      <Output TaskParameter="Lines" ItemName="ReadmeLines" />
-    </ReadLinesFromFile>
-
-    <Message Importance="high" Text="Updating relative links in README.md" />
+<PropertyGroup>
+  <PackageReadmeFile>README.md</PackageReadmeFile>
+  <PackageReleaseNotes>RELEASENOTES.md</PackageReleaseNotes>
+</PropertyGroup>
 
-    <WriteLinesToFile 
-    File="README.md" 
-    Lines="@(ReadmeLines->'%(Identity.Replace(&quot;CONTRIBUTING.md&quot;, &quot;https://github.com/open-telemetry/opentelemetry-dotnet/blob/main/CONTRIBUTING.md&quot;))')"
-    Overwrite="true" />
-</Target>
 
 </Project>