Fix TOC and installation commands

If you'd like to install DeepChem locally, we recommend using

:code:`conda`.  If you have :code:`conda` installed, you can install

DeepChem with the one-liner

DeepChem with GPU support with the one-liner

.. code-block:: bash

    conda install -y -c deepchem -c rdkit -c conda-forge -c omnia deepchem-gpu=2.3.0

    conda install -y -c deepchem -c rdkit -c conda-forge -c omnia deepchem-gpu

For CPU only support instead run

.. code-block:: bash

    conda install -y -c deepchem -c rdkit -c conda-forge -c omnia deepchem

Then open your python and try running.

.. important:: Join our `community gitter <https://forms.gle/9TSdDYUgxYs8SA9e8>`_ to discuss DeepChem. Sign up for our `forums <https://forum.deepchem.io/>`_ to talk about research, development, and general questions. 

.. toctree::

   :maxdepth: 4

   :maxdepth: 2

   :caption: Table of Contents 

   :name: mastertoc

------------------

If you'd like to install DeepChem locally, we recommend using

:code:`conda`.  If you have :code:`conda` installed, you can install

DeepChem with the one-liner

DeepChem with GPU support with the one-liner

.. code-block:: bash

    conda install -y -c deepchem -c rdkit -c conda-forge -c omnia deepchem-gpu=2.3.0

    conda install -y -c deepchem -c rdkit -c conda-forge -c omnia deepchem-gpu

For CPU only support instead run

.. code-block:: bash

    conda install -y -c deepchem -c rdkit -c conda-forge -c omnia deepchem

Then open your python and try running.