Create a small Design System from Luxe

[romain-pm]

Context

• More and more customers have a Design System that they want to reuse on their website
• These customers want to have code samples on how to achieve that
• There is already a library of components that is been introduced in luxe codebase: https://github.com/Jahia/luxe-jahia-demo/tree/main/src/commons

Goal of the ticket

• Make https://github.com/Jahia/luxe-jahia-demo/ a mono repo
• Move the library of shared components to a "design-system" subrepo
• Update the views to use these components from an external library

In other tickets and to be discussed:

• create a storybook from luxe DS
• refactor the components to be closer to a design system (tokens, atoms, molecules)