[ADD] OG tag + IOS PWA

[NamuIsTree]

• OG tag 추가
• PWA (상단 노치바 - 반투명 설정)
  • theme-color 설정 : meta 태그에 theme color가 따로 있는데, 추후 고민

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[NamuIsTree]

IOS status-bar 색상 수정하는 건 나중에 생각해보자..