add exploropleth url

Author: arpitnarechania

index.html

@@ -132,7 +132,7 @@ <h2>Exploropleth</h2>
                         allowfullscreen></iframe>
                 </div>
                 <div class="mt-3">
-                    <a class="btn btn-info btn-cta m-xs text-white"><i class="fas fa-file-pdf"></i> Paper</a>
+                    <a href="https://doi.org/10.1080/15230406.2025.2543483" target="_blank" class="btn btn-info btn-cta m-xs text-white"><i class="fas fa-file-pdf"></i> Paper</a>
                     &nbsp;
                     <a class="btn btn-green btn-cta m-xs" href="https://narechania.com/docs/posters/exploropleth_cridc_2023.pdf" target="_blank" download><i class="fas fa-image"></i> Best Poster Award (CRIDC'23)</a>
                 </div>