Removed unnecessary files created at project initialization

FullstackProsjekt/src/backend/main/java/edu/ntnu/idatt2105/controller/HelloController.java

-package edu.ntnu.idatt2105.controller;
-
-import org.springframework.http.HttpStatus;
-import org.springframework.http.ResponseEntity;
-import org.springframework.stereotype.Controller;
-import org.springframework.web.bind.annotation.RequestMapping;
-
-@Controller
-public class HelloController {
-
-    @RequestMapping("/")
-    public ResponseEntity<String> helloWorld(){
-        return new ResponseEntity<>("Hello", HttpStatus.OK);
-    }
-}
\ No newline at end of file

FullstackProsjekt/src/backend/test/java/edu/ntnu/idatt2105/CheckHTTPResponse.java

-package edu.ntnu.idatt2105;
-
-
-import org.junit.jupiter.api.Test;
-import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.boot.test.context.SpringBootTest;
-import org.springframework.boot.test.web.client.TestRestTemplate;
-import org.springframework.boot.test.web.server.LocalServerPort;
-
-import static org.junit.jupiter.api.Assertions.assertEquals;
-
-@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
-public class CheckHTTPResponse {
-    @LocalServerPort
-    private int port;
-
-    @Autowired
-    private TestRestTemplate testRestTemplate;
-
-    @Test
-    public void shouldPassIfStringMatches(){
-        assertEquals("Hello World from Spring Boot",
-                testRestTemplate.getForObject("http://localhost:" + port + "/",
-                        String.class));
-    }
-}