docs(zh): complate translate zh

[QC-L]

完成了如下工作：

• docs(zh): add zh docs path in index.js
• docs(zh): translate use-vue-in-markdown into Chinese
• docs(zh): translate writing into Chinese
• docs(zh): translate plugin into Chinese
• docs(zh): translate internationalization into Chinese
• docs(zh): translate deployment into Chinese
• docs(zh): translate customization into Chinese
• docs(zh): translate README into Chinese
• docs(en): fix instance spelling mistake
• docs(zh): translate plugin-api into Chinese
• docs(zh): translate options into Chinese
• docs(zh): translate credits-and-tradeoffs into Chinese
• docs(zh): translate builtin-components into Chinese
• docs: compare zh and en documents
• docs: move en docs into zh

ps: 如果添加英文内容，请直接在中文同样的位置也添加一份，否则会对翻译工作带来困难。

如有更新 @我 即可，很乐意帮你完成文档翻译这块。

[egoist]

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