fix: 폭이 좁은 경우 MDXRenderer에서 padding-inline-start가 0이도록 수정 #129

Job	Run time
config	3s
build (pyconkr-dev, pyconkr-2026)	51s
build (admin-dev, pyconkr-admin)	1m 3s
build (participant-dev, pyconkr-participant-portal)	45s
trigger	9s
	2m 51s

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