Add Leiden University and German BioImaging logos to footer

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: etzm

_includes/footer.html

@@ -26,6 +26,12 @@ <h4>Community</h4>
                     <a href="{{ site.data.site.community.iscc_foundation_url }}" target="_blank" rel="noopener" title="ISCC Foundation">
                         <img src="{{ '/assets/images/ISCC_Foundation_logo.png' | relative_url }}" alt="ISCC Foundation" loading="lazy">
                     </a>
+                    <a href="https://www.universiteitleiden.nl/" target="_blank" rel="noopener" title="Universiteit Leiden">
+                        <img src="{{ '/assets/images/Universiteit_Leiden_logo.png' | relative_url }}" alt="Universiteit Leiden" loading="lazy">
+                    </a>
+                    <a href="https://gerbi-gmb.de/" target="_blank" rel="noopener" title="German BioImaging">
+                        <img src="{{ '/assets/images/German_BioImaging_logo.png' | relative_url }}" alt="German BioImaging" loading="lazy">
+                    </a>
                 </div>
             </div>
         </div>