Hold on a second.
I didn't say the Vue.js docs are built with Vuepress (it's well known that they aren't...yet). But the Vuepress docs site does, as I stated. The Vuepress docs are here: github.com/vuejs/vuepress/tree/0.x..., and you can contribute as per usual. You can see the .vuepress file right in the expected place.
github.com/vuejs/vuepress/blob/0.x... - the scripts don't lie
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