If I'm not mistaken, the page you reference is already built by dokka, only an older version and with some UI tweaks
We do plan to migrate it to the newer 1.6 html format soon, but there are some migration issues we need to address first (like make sure all of the old links work and redirect correctly)
For how that's going to look, here's a raw snapshot: http://dokka-snapshots.s3.eu-central-1.amazonaws.com/1.6.0/stdlib/8d151d1/kotlin-stdlib/kotlin/index.html