style 파일 관리를 위해 폴더 분류 및 구조화

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wev.dev 참고

• settings: Global variables
• tools: Mixins and functions
• generic: Ground-zero styles and unclassed HTML elements (type selectors)
• components: Chunks of UI
• pages: Page-specific styles (use sparingly if at all)
• overrides: Utility classes for things like text alignment, box shadows, etc.
• yunha-site: YunhaSite specific styles we use to replicate their live environment. There's a file called _veto.scss which we use to nullify some of their styles.