Stop linking to this library from Vimeo API docs

[hawflakes]

Issue Summary

The page https://developer.vimeo.com/api/libraries still references this repo but this repo states that it's deprecated.

Reproduction Steps

Visit https://developer.vimeo.com/api/libraries which links here. See that it is deprecated.

Expected Behavior

I expect https://developer.vimeo.com/api/libraries to point to the current recommended library.
https://github.com/vimeo/PlayerKit

Actual Behavior

Linked here instead of to https://github.com/vimeo/PlayerKit