* Convert some CSS to LESS
* Split/Join LESS files
* Remove duplicates between website and web_editor
* UI improvements
* Allow simple customizations thanks to LESS var&mixins for website

The size of the ecommerce cart quantity component (- button, input with
quantity , + button) is by default fixed at a given width, but given
some theme styling the padding of the buttons are so big there is not
even one figure visible in the input.

With this change, the appearance doesn't change for most themes, but for
bootswatch Cosmo and Flatly we go from seeing 0 figure to at least two
figures.

opw-658224

On website_quote, according to the translation, the label may become much larger than
the button width. By default the bootstrap btn class has the property 'white-space: nowrap'
Here the goal is to add a class which will be used for these kind of cases.

Add !important flag to the width:auto rule for a container inside a
fixed width parent. Notice that there should not be any container
inside another container (this would allow to remove this rule) but
this makes sense for the "readable" class.

This fix is made to solve website themes issues.

Assets are now split in multiple files and there is not a route which
always leads to the last version of an asset. This commit adapts theme
customization (without reloading) to these new features.

Inconsistency between col-md and col-lg (offset)
Add auto word wrap to avoid that text override next column