Add NL-BioImaging logo and update German BioImaging logo in footer

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

Author: etzm

_includes/footer.html

@@ -33,6 +33,9 @@ <h4>Community</h4>
                     <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>
+                    <a href="https://eurobioimaging.nl/" target="_blank" rel="noopener" title="NL-BioImaging">
+                        <img src="{{ '/assets/images/NL-BioImaging_logo.png' | relative_url }}" alt="NL-BioImaging" loading="lazy">
+                    </a>
                 </div>
             </div>
         </div>