Translate: sync blog index, footer and preview

[hanseul-lee]

Progress

• [x] 번역 초안 작성 (Draft translation)
• [x] 공통 스타일 가이드 확인 (Check the common style guide)
• [x] 모범사례 확인 (Check best practices)
• [x] 용어 확인 (Check the term)
• [x] 맞춤법 검사 (Spelling check)
• [ ] 리뷰 반영 (Resolve reviews)

Changelog

블로그와 관련된 부분들 기존 번역 완료된 페이지와 확인하여 모두 통일해두었습니다.

1. 메인 페이지 하단
   • 블로그 프리뷰 기존 제목과 싱크 맞추기
2. 블로그 페이지 (/blog)
   • <BlogCard /> 제목, 날짜, 내용
     • 모두 번역 완료된 기존 페이지 및 인트로와 최대한 동일하게 반영
3. 블로그 포스트
   • 포스트 타이틀 아래 날짜, 작성자 형식으로 노출되도록 통일
   • 포스트 하단 Footer 링크 제목, 번역 완료된 페이지와 싱크 맞추기

4. Footer 와 Survey		screenshot
   as-is
   to-be

[github-actions[bot]]

Size changes

## 📦 Next.js Bundle Analysis for react-dev This analysis was generated by the [Next.js Bundle Analysis action](https://github.com/hashicorp/nextjs-bundle-analysis). 🤖 ### Three Pages Changed Size The following pages changed size from the code in this PR compared to its base branch: Page | Size (compressed) | First Load | |---|---|---| | `/404` | `76.77 KB` _(🟡 +69 B)_ | 179.92 KB | | `/500` | `76.77 KB` _(🟡 +69 B)_ | 179.92 KB | | `/[[...markdownPath]]` | `78.44 KB` _(🟡 +69 B)_ | 181.59 KB |

Details

Only the gzipped size is provided here based on an expert tip.

First Load is the size of the global bundle plus the bundle for the individual page. If a user were to show up to your website and land on a given page, the first load size represents the amount of javascript that user would need to download. If next/link is used, subsequent page loads would only need to download that page's bundle (the number in the "Size" column), since the global bundle has already been downloaded.

Any third party scripts you have added directly to your app using the <script> tag are not accounted for in this analysis

Next to the size is how much the size has increased or decreased compared with the base branch of this PR. If this percentage has increased by 10% or more, there will be a red status indicator applied, indicating that special attention should be given to this.