Remove redundant Main class, use RoadTrip instead

build.gradle.kts

@@ -30,7 +30,7 @@ java {
 }
 
 application {
-  mainClass.set("h07.Main")
+  mainClass.set("h07.experiment.RoadTrip")
 }
 
 tasks {

src/main/java/h07/Main.java

@@ -1,7 +0,0 @@
-package h07;
-
-public class Main {
-  public static void main(String[] args) {
-    System.out.println("Hello World!");
-  }
-}