docs: add webtransport.day

[luzhenqian]

trafficstars

docs: add webtransport.day

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[jecfish]

@heyawhite The translation is accurate but the presubmit seems like not running. Do you know how can I proceed to merge it?

[rachelandrew]

@jecfish presubmit now runs on each commit to a PR but that means older ones aren't running, we can admin merge them so let me know if there are others.

[chrome-devrel-review-bot]

Hello! This is an automated review by our custom reviewbot. It updates automatically when code or GitHub comments in this pull request are created or updated.

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src/site/content/zh/blog/webtransport/index.md

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