Update OceanParcels doc URL in Sphinx configuration

Change the intersphinx mapping for OceanParcels to its new documentation URL.
This ensures references to OceanParcels documentation are correctly resolved
during the build process.

docs/conf.py

@@ -52,7 +52,7 @@
 intersphinx_mapping = {
     "moaddocs": ("https://ubc-moad-docs.readthedocs.io/en/latest/", None),
     "numpy": ("https://numpy.org/doc/stable/", None),
-    "oceanparcels": ("https://oceanparcels.org/gh-pages/html/", None),
+    "oceanparcels": ("https://docs.oceanparcels.org/en/latest/", None),
 }
 
 # Add any paths that contain templates here, relative to this directory.