Reduce CLS and optimize portrait image

kontakt/index.html

@@ -65,7 +65,7 @@
 <!-- Leva stran: Podatki in zemljevid -->
 <div class="contact-details animate-on-scroll">
 <h2 class="section-title">Informacije za naročanje</h2>
-<img alt="Portret Hermina Merc" class="contact-portrait" decoding="async" height="400" loading="lazy" src="/assets/images/portret-small.webp" width="400"/>
+<img alt="Portret Hermina Merc" class="contact-portrait" decoding="async" height="250" loading="lazy" sizes="(max-width: 768px) 200px, 250px" src="/assets/images/portret-small.webp" srcset="/assets/images/portret-small.webp 250w, /assets/images/portret-small@2x.webp 500w" width="250"/>
 <div class="contact-info-item">
 <p class="info-data"><strong>Mag. HERMINA MERC</strong><br/>Psihoterapevt Specialist Klinični Psiholog</p>
 </div>