feat: section의 CSS도 편집 가능하게 수정 #56

Job	Run time
config	2s
build (pyconkr-dev, pyconkr-2026)	43s
build (admin-dev, pyconkr-admin)	53s
build (participant-dev, pyconkr-participant-portal)	46s
trigger	10s
	2m 34s

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