fix: infinite height increase with auto options(#551)

[jung-han]

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Description

#551

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Thank you for your contribution to TOAST UI product. 🎉 😘 ✨

[jungeun-cho]

responsive 관련 예제파일에서 컨테이너 width, height값 지정해주고 옵션으로 둘다 'auto' 지정해주는게 어떻할까요?

<div id="chart-area" style="width:90vw; height:90vh;"></div>

const options = {
  chart: { title: 'Monthly Revenue', width: 'auto', height: 'auto' },
  /* ... */
};