More cleanup, fix default icon dimensions

src/routes.go

@@ -66,12 +66,16 @@ func IconHandler(ctx *fiber.Ctx) error {
 		return ctx.Status(http.StatusBadRequest).SendString("Invalid address value")
 	}
 
-	icon, err := GetServerIcon(host, port)
+	icon, expiresAt, err := GetServerIcon(host, port)
 
 	if err != nil {
 		return err
 	}
 
+	if expiresAt != nil {
+		ctx.Set("X-Cache-Time-Remaining", strconv.Itoa(int(expiresAt.Seconds())))
+	}
+
 	return ctx.Type("png").Send(icon)
 }