Add link to COSIMA Recipes model agnostic tutorial (#397)

* Add link to COSIMA Recipes model agnostic tutorial

* Apply suggested change to link text

Author: aidanheerdegen

doc/index.rst

@@ -34,7 +34,8 @@ or using ``conda``
 
    examples/introduction
    EarthCube 2021 demo <https://earthcube2021.github.io/ec21_book/notebooks/ec21_cherian_etal/DC_01_cf-xarray.html>
-   Ocean model demo <https://pop-tools.readthedocs.io/en/latest/examples/cesm-cmip-cf-xarray.html>
+   CESM ocean model demo <https://pop-tools.readthedocs.io/en/latest/examples/cesm-cmip-cf-xarray.html>
+   COSIMA ocean-sea ice model demo <https://cosima-recipes.readthedocs.io/en/latest/tutorials/Model_Agnostic_Analysis.html#gallery-tutorials-model-agnostic-analysis-ipynb>
 
 .. toctree::
    :maxdepth: 2