i18n(zh-cn): Translate 5.x started docs

[lujl]

Description

• Translation src\i18n\ui\zh-cn.json
• Translation src\content\docs\zh-cn\5x\starter\installing.mdx
• Translation src\content\docs\zh-cn\5x\starter\hello-world.mdx
• Translation src\content\docs\zh-cn\5x\starter\generator.mdx
• Translation src\content\docs\zh-cn\5x\starter\basic-routing.mdx
• Translation src\content\docs\zh-cn\5x\starter\examples.mdx
• Translation src\content\docs\zh-cn\5x\starter\faq.md

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[ShubhamOulkar]

Please read i18n doc 🙏 https://github.com/expressjs/expressjs.com/blob/main/docs%2Fi18n.md