docs: website for LiquidJS

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harttle
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title: 真和假
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虽然我们希望 [Liquid][sl] 是平台无关的,但 JavaScript 版本和 [Ruby 版本][ruby] 仍然有[很多区别][diff],真值就是其中之一。
## 真值表
根据 [Shopify 的文档](https://shopify.github.io/liquid/basics/truthy-and-falsy/),Ruby 版本除了 `false` 和 `nil` 之外的所有值都是真,但 JavaScript 有完全不同的类型系统,比如我们有 `undefined` 类型,以及不区分 `integer` 和 `float`,因此有些不同:
value | truthy | falsy
--- | --- | ---
`true` | ✔️ |
`false` | | ✔️
`null` | | ✔️
`undefined` | | ✔️
`string` | ✔️ |
`empty string` | ✔️ |
`0` | ✔️ |
`integer` | ✔️ |
`float` | ✔️ |
`array` | ✔️ |
`empty array` | ✔️ |
[ruby]: https://shopify.github.io/liquid
[sl]: https://www.npmjs.com/package/liquidjs
[diff]: https://github.com/harttle/liquidjs#differences-and-limitations