refactor: simplify footer by removing trust badges and adding student notice

Removed the trust/marketing badges (paiement sécurisé, livraison rapide,
certifié RGPD) from the footer and replaced them with a simple "Site étudiant"
notice centered below the copyright. This makes it clear the site is for
educational purposes.

Changes:
- Removed 🔒 Paiement sécurisé badge
- Removed 📦 Livraison rapide badge
- Removed ✓ Certifié RGPD badge
- Added "Site étudiant" notice centered in footer
- Simplified footer layout to center-aligned

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

components/Footer.tsx

@@ -186,15 +186,13 @@ export default function Footer() {
       {/* Bottom Bar */}
       <div className="border-t border-white/10">
         <div className="container mx-auto px-4 py-6">
-          <div className="flex flex-col md:flex-row items-center justify-between gap-4 text-sm">
+          <div className="flex flex-col items-center justify-center gap-2 text-sm">
             <p className="text-white/80">
               © {currentYear} Thé Tip Top. Tous droits réservés.
             </p>
-            <div className="flex gap-4 text-white/60 text-xs">
-              <span>🔒 Paiement sécurisé</span>
-              <span>📦 Livraison rapide</span>
-              <span>✓ Certifié RGPD</span>
-            </div>
+            <p className="text-white/60 text-xs">
+              Site étudiant
+            </p>
           </div>
         </div>
       </div>