Add Three.js, PDF.js and Tauri logos to credits page

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: DutchSailor

credits/index.html

@@ -577,15 +577,18 @@ <h4>Ubuntu</h4>
           <h4>Git</h4>
           <p>Versiebeheer voor de wereld. Samenwerken aan code op globale schaal.</p>
         </div>
-        <div class="project-card">
+        <div class="project-card" style="text-align:center;">
+          <img src="https://threejs.org/files/favicon.ico" alt="Three.js" style="height: 80px; width: auto; margin-bottom: 12px;">
           <h4>Three.js</h4>
           <p>3D graphics op het web. De basis voor interactieve 3D-ervaringen in de browser.</p>
         </div>
-        <div class="project-card">
+        <div class="project-card" style="text-align:center;">
+          <img src="https://mozilla.github.io/pdf.js/images/logo.svg" alt="PDF.js" style="height: 80px; width: auto; margin-bottom: 12px;">
           <h4>PDF.js</h4>
           <p>PDF rendering in de browser. Open source alternatief voor proprietary PDF-viewers.</p>
         </div>
-        <div class="project-card">
+        <div class="project-card" style="text-align:center;">
+          <img src="https://tauri.app/img/Tauri.svg" alt="Tauri" style="height: 80px; width: auto; margin-bottom: 12px;">
           <h4>Tauri</h4>
           <p>Lichtgewicht desktop apps. Webtech met native performance en kleine bundles.</p>
         </div>