[IMP] website, *: allow to use a color preset for menu and footer

*: web_editor, web

Also now allows to control the copyright section color.

This commit also allows to use color name alias when the user choose
one of the 5 main colors or a gray color for one component (e.g. if the
user picks 'o-color-1' as the color for its text in preset 4, then it
will no longer be linked to the current css color of 'o-color-1' but to
'o-color-1' directly; meaning that if that color changes in the future,
so will the text of preset 4).

Part of https://github.com/odoo/odoo/pull/52223
task-2197038