Update temporary accessible PDF link expiration date in index.html

Author: Zehui-Lin

PerceptGuide/index.html

@@ -323,7 +323,7 @@ <h1>Publications</h1>
                         <div class="links">
                             <a href="javascript:;" onclick="show_hide('Biblin2025orchestration')"> Bibtex </a>
                             | <a href="https://doi.org/10.1016/j.media.2025.103639"> PDF </a>
-                            | <a href="https://arxiv.org/abs/2409.12345"> Temporary Accessible PDF [expired: 2025-09-30] </a>
+                            | <a href="https://authors.elsevier.com/c/1lAXd4rfPmLew4"> Temporary Accessible PDF [expired: 2025-07-17] </a>
                             | <a href="https://github.com/Zehui-Lin/PerceptGuide"> Code </a>
                         </div>