docs: update zh/guide/getting-started.md

[huzhengen]

I don't think tree-shaking needs to be translated into Chinese.

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[enpitsuLin]

This pr didn't appear on my github notification, petty weird

Tree shaking can be translated as "除屑优化" or "摇树/摇树优化" which was common in most Chinese translations like vue/rollup, so actually here should be my mistake, it's reversed😅

Keep it untranslated also makes sense, I think maybe we need more Chinese speakers' advice, @X-smart what's your opinion?