Improve guidance for ASP.NET Core

[mattjohnsonpint]

Problem Statement

The ASP.NET Core documentation page could be much clearer.

So could the samples.

Solution Brainstorm

• Lead with the current version of ASP.NET Core.
• Add sections for older versions, either collapsed or in tabs.
• Reduce the list of features so it doesn't take up so much of the first page.
• Make sure EnableTracing and UseSentryTracing are visible in all examples.
• Make sure its clear what order UseSentryTracing goes in the middleware (after UseRouting, but why and what if that's not present?)
• Update samples to use the current ASP.NET Core. Start from templates dotnet new web / webapi / mvc, etc.
  • No need to show every feature of Sentry. Just show what's needed to get started in ASP.NET Core.
  • Sentry.Samples.AspNetCore.Basic
  • Sentry.Samples.AspNetCore.Blazor.Server
  • Sentry.Samples.AspNetCore.Blazor.Wasm
  • Sentry.Samples.AspNetCore.Grpc
  • Updated ASP.NET Core MVC sample to use the latest dotnet template #3083
  • Sentry.Samples.AspNetCore.Serilog
  • An ASP.NET Core AOT sample - New project template
• Add a few limited samples for older versions of ASP.NET Core, but only where drastically different from current.