Update copyright line

Author: mstoelzle

mkdocs.yml

@@ -7,7 +7,7 @@ repo_name: tud-phi/jax-soft-robot-modelling
 repo_url: https://github.com/tud-phi/jax-soft-robot-modelling
 edit_uri: edit/main/docs/
 
-copyright: Copyright © 2023-2025 TU Delft Robotics Institute
+copyright: Copyright © 2020-2025 Physical Intelligence (PhI) Lab @ TU Delft
 
 theme:
   name: material