Move hub url for docker to appsettings.json

[BekAllaev]

Move this line to appsettings.json and read it from there

Observability_WebAPI_Blazor/Observability_WebAPI_Blazor/Observability_WebAPI_Blazor.Client/Pages/Chat.razor

Line 96 in d65b2a2

return new Uri($"http://web:8080{hubPath}");