make /models endpoint work by upgrading nugets and remove postgre dependency

Author: Toumash

EntityFrameworkCore.Diagrams/EntityFrameworkCore.Diagrams.Demo/EntityFrameworkCore.Diagrams.Demo.csproj

@@ -9,7 +9,6 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="EntityFrameworkCore.Diagrams" Version="0.4.2" />
     <PackageReference Include="Microsoft.ApplicationInsights.AspNetCore" Version="2.19.0" />
     <PackageReference Include="Microsoft.AspNetCore" Version="2.2.0" />
     <PackageReference Include="Microsoft.AspNetCore.Mvc" Version="2.2.0" />
@@ -21,12 +20,13 @@
     </PackageReference>
     <PackageReference Include="Microsoft.EntityFrameworkCore.InMemory" Version="5.0.12" />
     <PackageReference Include="Microsoft.Extensions.Logging.Debug" Version="5.0.0" />
-    <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="5.0.10" />
-    <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL.Design" Version="1.1.0" />
   </ItemGroup>
   <ItemGroup>
     <DotNetCliToolReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Tools" Version="1.0.1" />
     <DotNetCliToolReference Include="Microsoft.EntityFrameworkCore.Tools.DotNet" Version="1.0.0" />
   </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\EntityFrameworkCore.Diagrams\EntityFrameworkCore.Diagrams.csproj" />
+  </ItemGroup>
 
 </Project>