Bug 9521: Move common jQuery assets to koha-tmpl/intranet-tmpl/lib

Bug 9521: Move common jQuery assets to koha-tmpl/intranet-tmpl/lib

Assets which are not theme-specific can now be placed in
koha-tmpl/intranet-tmpl/lib. This patch moves jQuery assets referenced
by doc-head-close.inc to this location and corrects the path in the
include.

To test, load any page in the staff client which uses jQuery and confirm
that there are no JavaScript errors. Test keyboard shortcuts (Alt-r,
Alt-u, Alt-q), Search to hold functionality, and search term
highlighting to confirm that jQuery plugins are working correctly.

Revision corrects some additional instances in help-top.inc and removes
a redundant call to the highlight script in preferences.tt

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>