Use Serilog in API

PluralKit.API/Program.cs

@@ -6,6 +6,8 @@ using Microsoft.Extensions.Hosting;
 
 using PluralKit.Core;
 
+using Serilog;
+
 namespace PluralKit.API
 {
     public class Program
@@ -19,8 +21,8 @@ namespace PluralKit.API
         public static IHostBuilder CreateHostBuilder(string[] args) =>
             Host.CreateDefaultBuilder(args)
                 .UseServiceProviderFactory(new AutofacServiceProviderFactory())
+                .UseSerilog()
                 .ConfigureWebHostDefaults(whb => whb
-
                     .UseConfiguration(InitUtils.BuildConfiguration(args).Build())
                     .ConfigureKestrel(opts =>
                     {