refactor: DifeApplication 이름 변경 (#48)

- Mono로 합쳐짐에 따라, DifeApplication으로 메인 어플리케이션의 이름을
변경한다.

rest-api/src/main/java/com/dife/api/MemberApplication.java → rest-api/src/main/java/com/dife/api/DifeApplication.java

@@ -4,10 +4,10 @@
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 
 @SpringBootApplication
-public class MemberApplication {
+public class DifeApplication {
 
 	public static void main(String[] args) {
-		SpringApplication.run(MemberApplication.class, args);
+		SpringApplication.run(DifeApplication.class, args);
 	}
 
 }

rest-api/src/test/java/com/dife/api/MemberApplicationTests.java → rest-api/src/test/java/com/dife/api/DifeApplicationTests.java

@@ -4,7 +4,7 @@
 import org.springframework.boot.test.context.SpringBootTest;
 
 @SpringBootTest
-class MemberApplicationTests {
+class DifeApplicationTests {
 
 	@Test
 	void contextLoads() {