Add intersphinx mapping

Closes #82

_config.yml

@@ -77,3 +77,26 @@ sphinx:
       scipy-tutorial/00_overview.ipynb: overview/get-started.md
 
     bibtex_reference_style: author_year # or label, super, \supercite
+
+    intersphinx_mapping:
+      xarray:
+        - https://docs.xarray.dev/en/stable/
+        - null
+      numpy:
+        - https://numpy.org/doc/stable
+        - null
+      scipy:
+        - https://docs.scipy.org/doc/scipy
+        - null
+      matplotlib:
+        - https://matplotlib.org/stable/
+        - null
+      dask:
+        - https://docs.dask.org/en/latest
+        - null
+      python:
+        - https://docs.python.org/3/
+        - null
+      pandas:
+        - https://pandas.pydata.org/pandas-docs/stable
+        - null