perf: optimize homepage and logo images to webp

privat/CV/andreknie.de/src/pages/Home.jsx

@@ -9,11 +9,11 @@ import PhotoBand from '../components/PhotoBand'
 import './Home.css'
 
 const PHOTO_BAND_IMAGES = [
-  '/images/workshop-1.jpg',
-  '/images/keynote-1.jpg',
-  '/images/workshop-2.jpg',
-  '/images/panel-1.jpg',
-  '/images/workshop-3.jpg',
+  '/images/workshop-1.webp',
+  '/images/keynote-1.webp',
+  '/images/workshop-2.webp',
+  '/images/panel-1.webp',
+  '/images/workshop-3.webp',
 ]
 
 export default function Home() {
@@ -24,7 +24,7 @@ export default function Home() {
       {/* Hero */}
       <section className="hero">
         <div className="app-container hero-content">
-          <img src="/images/andre-knie.png" alt="Dr. André Knie" className="hero-photo" />
+          <img src="/images/andre-knie.webp" alt="Dr. André Knie" className="hero-photo" />
           <h1>
             {profile?.name || 'Dr. André Knie'}
           </h1>