Remove library that is not being used #172
Description
We have a library created for this module which just adds a CSS file.
However, the CSS does not target a class that is available in the template that it works on.
We have a layout defined in the .layouts.yml file to use the layout--onecol--flexibible template, then a CSS file to target .row (which in any case is way to general and potentially could affect .row in other places), but we have no CSS class for .row in the layout--onecol--flexible.html.twig template.
Unless I am wrong, this library is doing nothing (and by corollary, the template is doing nothing any different to our default one column template).