I removed two unneeded references from WeatherClient.cs
The instructions generate code in the new format, which results in only a `Program.cs` file needing the following code:
```
var builder = WebApplication.CreateBuilder(args);
// Add services to the container.
builder.Services.AddRazorPages();
builder.Services.AddHttpClient<frontend.WeatherClient>(client =>
{
client.BaseAddress = builder.Configuration.GetServiceUri("backend");
});
var app = builder.Build();
// Configure the HTTP request pipeline.
if (!app.Environment.IsDevelopment())
{
app.UseExceptionHandler("/Error");
// The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
app.UseHsts();
}
app.UseHttpsRedirection();
app.UseStaticFiles();
app.UseRouting();
app.UseAuthorization();
app.MapRazorPages();
app.Run();
```
Implements two flavor of library support for service-discovery:
- GetConnectionString (arbitrary strings) augmenting existing
functionality already in asp.net core
- GetServiceUri (uris) can be combined
from a protocol/host/port triple
See the **extensive** doc `service_discovery.md` that is filled out in this PR. That documents pretty much everything about how this works now.