[Restitution] allow classModifier and universes styling

[MartinWeb]

Issue and Steps to Reproduce

The component Restitution doesn't allow a classModifier for the header to be styled according to the different universes colors (like component table for example).

Versions

2.0.0-alpha.5

Expected

HeaderRestitution to change color based on a classModifier.

Actual

We cannot provide a classModifier to HeaderRestitution or to ArticleRestitution