chore: add zh-Hans (Chinese, simplified) translation

[YDX-2147483647]

Blocked by #20.

Preview: https://ydx-2147483647.github.io/typst/.

Feedbacks from the Chinese community

• Font: HK Grotesk and BIZ UDGothic are not suitable for Chinese. Although we can recognize they're Han characters, it feels strange.
• Discord icon: Discord is not popular in China (at least in mainland). We use QQ. Simple Icons has (a CC0 variant of) its icon. Done in feat: support general social links and icons #39.

Other known issues that need to be fixed outside typst-docs-web

The following issues are out of the scope of typst-docs-web.

• **译者注：** collides with 💡.
• /reference/math/attach should be put at /reference/math/attach/, to be consistent with other pages.

[3w36zj6]

Would zh-cmn-Hans-CN be better than zh-Hans?

Feedback from the Chinese community is informative. Since the appropriate font family may differ between languages, it would be good to either make fonts easily replaceable or switch to a font that can be used consistently across many languages. Also, I think it would be convenient to make it easy to extend the social icons in the header.

[YDX-2147483647]

Would zh-cmn-Hans-CN be better than zh-Hans?

Yes, that's the most accurate code. However, I don't want it to be too specific. Considering that only one single Chinese translation is provided at present, I think zh-Hans is better.

In fact, I've considered between zh-Hans and zh-CN. I chose zh-Hans because CLReq uses that.

Also, I think it would be convenient to make it easy to extend the social icons in the header.

How about changing discordServerUrl: string; githubRepositoryUrl: string to social: OrderedMap<'github' | 'discord' | 'qq' | 'homepage' | …, { url: string, icon: Fragment, aria_text: string }>?
This can also support reordering the icons in the Header and Footer.

either make fonts easily replaceable or switch to a font that can be used consistently across many languages

I inspect the current design and have no idea how can the former be implemented…
As for the latter, I guess Source Han Sans & Serif are the only options?

[netlify]

❌ Deploy Preview for typst-docs-web failed. Why did it fail? →

Name	Link
🔨 Latest commit	c04d053
🔍 Latest deploy log	https://app.netlify.com/projects/typst-docs-web/deploys/6930f0d83e4b2400087ad4b1