Update conf.py (update of #252) (#254)

Update conf.py

Author: MMathisLab

docs/source/conf.py

@@ -270,7 +270,9 @@ def get_years(start_year=2021):
     "demo_notebooks/Demo_dandi_NeuroDataReHack_2023":
         "_static/thumbnails/dandi_demo_monkey.png",
     "demo_notebooks/Demo_xCEBRA_RatInABox":
-        "_static/thumbnails/xCEBRA.png"
+        "_static/thumbnails/xCEBRA.png",
+    "demo_notebooks/Demo_hippocampus_unified":
+        "_static/thumbnails/UnifiedCEBRA.png"
 }
 
 rst_prolog = r"""