Update landmark table link in index.qmd to use relative URL

Author: JuliusWelzel

index.qmd

@@ -62,7 +62,7 @@ A **coordinate system** is fully described by:
 </style>
 
 <div class="centered-button">
-  <a href="https://human-sensor-placement.github.io/anatomical_table.html" class="button-box">Landmark table</a>
+  <a href="anatomical_table.html" class="button-box">Landmark table</a>
 </div>