fix all config.json paths

Program.cs

@@ -55,7 +55,7 @@ static Config LoadConfig()
         Environment.Exit(1);
     }
 
-    var configFile = File.ReadAllText("config.json");
+    var configFile = File.ReadAllText("/config.json");
     return JsonSerializer.Deserialize<Config>(configFile, serializationOptions);
 }
 
@@ -64,7 +64,7 @@ static void CreateConfig(JsonSerializerOptions options)
     var dummyGrab = new GrabTarget(@"/path/to/source", @"/path/to/destination");
     var dummySFtp = new SFtpTarget("ftp.domain.example", 22, "username", false, "password");
     var config = new Config(dummySFtp, [dummyGrab, dummyGrab], "* * * * *");
-    File.WriteAllText("config.json", JsonSerializer.Serialize(config, options));
+    File.WriteAllText("/config.json", JsonSerializer.Serialize(config, options));
 }
 
 static async Task ScheduleJobs(Config config, CancellationToken token)