doctools: fix shortcuts

Previous code was using JQuery to add the listeners
https://github.com/sphinx-doc/sphinx/blob/b3812f72a98b01bae4b1158761082edc46cfa87f/sphinx/themes/basic/static/doctools.js#L304

Looks like by convention returning false mean preventDefault,
but now with pure js this needs to be called explicitly.

And a couple of fixes with the selectors.

- querySelectorAll is an array-like object, it doesn't have a first()
  method.
- nextLink was being assigned the `href` attribute instead of the
  object itself.

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