[Refactor] 온보딩 페이지 폴더구조 변경 (#234)

* refactor: 온보딩 페이지 컴포넌트 폴더 삭제 및 컴포넌트명으로 폴더 생성하여 적용 (#230)

* refactor: 상아 피드백 반영해서 컴포넌트 depth 1로 고정 (#230)

src/pages/OnboardingPage/OnboardingPage.tsx

@@ -1,6 +1,8 @@
 import { useState } from 'react';
 
-import { StepField, StepService, StepStart } from './components';
+import StepField from './StepField/StepField';
+import StepService from './StepService/StepService';
+import StepStart from './StepStart/StepStart';
 import { FIELDS } from './constants';
 import { useFunnel } from './hooks/useFunnel';
 

src/pages/OnboardingPage/components/Step/StepService/StepService.tsx → src/pages/OnboardingPage/StepService/StepService.tsx

@@ -2,7 +2,9 @@ import { ChangeEvent, KeyboardEvent, useState } from 'react';
 
 import { BackIcon } from '@/shared/assets/home/svgs';
 
-import { BoxAllowedService, ButtonService, Tabs } from './components';
+import BoxAllowedService from './BoxAllowedService/BoxAllowedService';
+import ButtonService from './ButtonService/ButtonService';
+import Tabs from './Tabs/Tabs';
 
 interface StepServiceProps {
 	setStep: (step: string) => void;