브라우저 마다 폰트 일관성을 위한 작업

[je0ngyun]

• 디자인 일관성을 위해 font weight마다 font face 지정
• PostItem title font weight 조정
• typography h1,h2 font weight 조정
• 기존 Layout 에서 적용된 global style을 gatsby-browser.js에서 import 하도록 변경

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