separate the mesh docs into their own section (#221)

Author: zingale

docs/source/index.rst

@@ -22,8 +22,14 @@ pyro: a python hydro code
    running
    output
    problems
+
+.. toctree::
+   maxdepth: 1
+   :caption: mesh
+
    mesh_basics
    mesh-examples.ipynb
+   spherical-mesh.ipynb
 
 .. toctree::
    :maxdepth: 1

docs/source/mesh_basics.rst

@@ -96,15 +96,6 @@ Note that each variable needs to specify a BC—this allows us to do
 different actions for each variable (for example, some may do even
 reflection while others may do odd reflection).
 
-Jupyter notebook
-----------------
-
-A Jupyter notebook that illustrates some of the basics of working with
-the grid is provided as `mesh-examples.ipynb <https://github.com/python-hydro/pyro2/blob/main/pyro/mesh/mesh-examples.ipynb>`_. This will
-demonstrate, for example, how to use the :func:`ArrayIndexer <pyro.mesh.array_indexer.ArrayIndexer>` methods to
-construct differences.
-
-
 Tests
 -----
 

docs/source/spherical-mesh.ipynb

@@ -0,0 +1 @@
+../../pyro/mesh/spherical-mesh.ipynb