Add visual to component documentation pages

[maximepvrt]

Description

It would be great to include these visuals directly in the component documentation pages, especially for layout components, to quickly understand their purpose at a glance.

For example, the visual could be added to the right side of the UPageHeader in the documentation. Clicking on the image could open a modal with a larger view for better readability.

Additional context

linked to this comment : #1289 (comment)

[maximepvrt]

@atinux ;-)

[HugoRCD]

@maximepvrt Indeed it would be nice, and we're just thinking about it!

[maximepvrt]

@HugoRCD Yes, I discussed it this morning with @atinux, and he asked me to create this issue ;-)