Update footer by removing sponsors

Removed Inria and CRIStAL sponsor logos from footer.

Author: cmezzina

_includes/footers/2026.html

@@ -4,14 +4,7 @@
       <img alt="Uniurb logo" src="/2026/sponsors/uniurb-logo.png" />
   </a></span>
 
-<!--  <span class="sponsor"><a href="https://inria.fr/en" target="_blank">
-      <img alt="Inria logo" src="/2025/sponsors/RF-Inria_Logo_RVB.png" />
-  </a></span>
-  
-  <span class="sponsor"><a href="https://www.cristal.univ-lille.fr/en/?force_lang=true" target="_blank">
-      <img alt="CRIStAL logo" src="/2025/sponsors/cristal.png" />
-  </a></span>
-  -->
+
   <span class="sponsor"><a href="https://www.springer.com" target="_blank">
       <img alt="Springer logo" src="https://www.springer.com/public/images/springer-logo.svg" />
   </a></span>