Latest alpha release is not loading the front-end

[ChristopherJennings]

Brief bug description

The front-end is not loading properly in the latest alpha release

Repro steps

1. Download the latest alpha release
2. Run KenticoInspector.WebApplication.exe
3. Load the URL in a brower
4. Observe that the error in the console window:

Hosting environment: Production
Content root path: C:\Tools\Kentico.Inspector.4.0.0-alpha.3
Now listening on: http://localhost:5000
Application started. Press Ctrl+C to shut down.
fail: Microsoft.AspNetCore.Server.Kestrel[13]
      Connection id "0HLOQ9SDTNFRE", Request id "0HLOQ9SDTNFRE:00000001": An unhandled exception was thrown by the application.
System.InvalidOperationException: The SPA default page middleware could not return the default page '/index.html' because it was not found, and no other middleware handled the request.
Your application is running in Production mode, so make sure it has been published, or that you have built your SPA manually. Alternatively you may wish to switch to the Development environment.

   at Microsoft.AspNetCore.SpaServices.SpaDefaultPageMiddleware.<>c__DisplayClass0_0.<Attach>b__1(HttpContext context, Func`1 next)
   at Microsoft.AspNetCore.Routing.EndpointMiddleware.Invoke(HttpContext httpContext)
   at Microsoft.AspNetCore.Routing.EndpointRoutingMiddleware.Invoke(HttpContext httpContext)
   at Microsoft.AspNetCore.StaticFiles.StaticFileMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.ProcessRequests[TContext](IHttpApplication`1 application)

Expected behavior

Kentico Inspector loads properly

Test environment

• Platform/OS: Windows 10
• Browser Chrome
• Version 4.0.0-alpha.3

Additional context

Initially report in #301