Bug 32998: Consolidate opac-tmpl/lib and opac-tmpl/bootstrap/lib

Bug 32998: Consolidate opac-tmpl/lib and opac-tmpl/bootstrap/lib

This patch moves OPAC third-party assets from opac-tmpl/bootstrap/lib
to opac-tmpl/lib, eliminating some redundancy and making it simpler
to understand where such assets should be found.

To test, apply the patch and confirm that there is no longer a lib
directory under opac-tmpl/bootstrap.

Test various parts of the OPAC to confirm that assets are still loading
correctly. Everything should look right and work correctly. The
browser's developer console should be free of errors.

Signed-off-by: Philip Orr <philip.orr@lmscloud.de>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>