doc: chinese (and other) translations

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Originally opened by @TomorJM in cuelang/cue#970

Is there any plan to add Chinese version documents?

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Original reply by @myitcv in cuelang/cue#970 (comment)

Whilst we don't have an active plan for actually writing translations of any of the docs, we would very much support and welcome any such contributions. Indeed I suggest we use this issue in order to plan and coordinate any efforts, even for translations of https://cuelang.org/ (which lives at https://github.com/cuelang/cuelang.org).