I am working on the following site: <https://www.jls-concept.fr/>  

The template is loading jQuery twice:  

 - once from Joomla: <https://www.jls-concept.fr/media/jui/js/jquery.min.js>  

 - and another time here: <https://www.jls-concept.fr/templates/superfine/assets/js/assets.min.js>

where the template author wisely decided to put the minification of several javascript libraries there.

I have tried removing the extra jQuery in assets file, but the site stops working. 

I tried changing the content of both js files, trying to make both load the same version but to no avail.

I don't have much expertise with joomla nor frontend. 

Any help is much appreciated.