Update Login and Registration for new api configuration

frontend/src/app/Services/auth.service.ts

@@ -11,18 +11,19 @@ const httpOptions = {
 })
 export class AuthService {
   constructor(private http: HttpClient) {}
-  login(username: string, password: string): Observable<any> {
+  login(email: string, password: string): Observable<any> {
     return this.http.post(AUTH_API + '/login', {
-      username,
+      email,
       password,
     });
   }
-  register(username: string, password: string): Observable<any> {
+  register(email: string, username: string, password: string): Observable<any> {
     return this.http.post(
       AUTH_API + '/register',
       {
-        username,
+        email,
         password,
+        username,
       },
       httpOptions
     );