use PackageReference for workbooks

source/SkiaSharp.Workbooks/SkiaSharp.Workbooks.csproj

@@ -34,12 +34,7 @@
     <Compile Include="Properties\SkiaSharpWorkbooksAssemblyInfo.cs" />
   </ItemGroup>
   <ItemGroup>
-    <Reference Include="Xamarin.Interactive">
-      <HintPath>..\packages\Xamarin.Workbooks.Integration.1.0.0-rc2\lib\portable-net45+win8+wpa81\Xamarin.Interactive.dll</HintPath>
-    </Reference>
-  </ItemGroup>
-  <ItemGroup>
-    <None Include="packages.config" />
+    <PackageReference Include="Xamarin.Workbooks.Integration" Version="1.0.0-rc2" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\..\binding\SkiaSharp.Portable\SkiaSharp.Portable.csproj">

source/SkiaSharp.Workbooks/packages.config

@@ -1,4 +0,0 @@
-<?xml version="1.0" encoding="UTF-8" ?>
-<packages>
-	<package id="Xamarin.Workbooks.Integration" version="1.0.0-rc2" />
-</packages>