docs(zh,en): Update translation of core-concepts/index, move SSR link forward to new mention

[PrainLopez]

packages/docs/zh/core-concepts/index.md 更新翻译同步英文文档现版本，个人经验不足，72行需要一些review Update the docs/zh translation to latest. May need review at line 72 due to my experience.

packages/docs/core-concepts/index.md In the process of translating I found a bug, the line 71 was added after line 73 while the SSR link is remained. Has moved it forward and cancelled the latter one on line 73.

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[PrainLopez]

packages/docs/core-concepts/index.md In the process of translating I found a bug, the line 71 was added after line 73 while the SSR link is remained. Has moved it >forward and cancelled the latter one on line 73.

This is now causing conflict, should I submit it in a seperate PR as it's issue of EN docs? (add), I've already done this link move in docs/zh, I know that by any result keeping docs sync is priority