Update documentation for SRW App (#349)

* release/public-v2

Update conf.py file for latest version of Sphinx.

* release/public-v2

Add ufs_utils.rst file.  Attempt to link chgres_cube.rst
to ufs_utils.rst.

* release/public-v2  Try add subsections.

* release/public-v2  update

* release/public-v2  update

* release/public-v2  update

* release/public-v2 updates

* release/public-v2  updates

* release/public-v2 update

* release/public-v2  update

* release/public-v2  updates

* release/public-v2  update.

* release/public-v2  update

* release/public-v2  update

* release/public-v2 update

* release/public-v2  update

* release/public-v2  fix length of title underlines.

* release/public-v2  move figure

* release/public-v2  update

* release/public-v2  replace 'chgres' with 'ufs_utils' in conf.py.

* release/public-v2 remove build instructions

Issue #97

* release/public-v2  Remove references to gfdl grids.

Issue #97.

* release/public-v2  add topo filtering section.

Issue #97

* release/public-v2

Fixes #97

* release/public-v2

Fixes #97.

* release/public-v2  update chgres_cube.rst

Fixes #97

* release/public-v2  updates to chgres_cube.rst

Fixes #97