Premium: high-end support

Premium is not a fourth area of expertise: it is a cross-cutting level of support, available as an add-on across our three areas (mobile apps,websites andautomation & AI). It includes dedicated support, a stronger SLA and priority guidance for the projects that require it.

Positioning repositioned by default during the redesign (see tasks/architecture-3-piliers.md): to be validated with Jimmy before final publication.