Before this commit, the configurator was its own frontend application.
With the website edition UI moved to the backend, it makes also sense to
move the configurator to the backend, as a client action, so that it is
easy to trigger it after installing a website (or the website module),
and returning to the website_preview client action after having
completed it.
This commit adds a new color_palettes.scss file, added in the
assets_backend, that will print the values of the color palettes (so
that some js can handle it). For now, it is needed for the configurator
and the editor. It will probably need to be reviewed later to not put
everything in backend assets.
See merge commit for more information.
task-2687506
Younn Olivier
caefcb8590