Fix issues with GCHP ReadTheDocs build; update badges

docs/source/conf.py
- Added missing ' character at the end of the version number

docs/source/index.rst
- Updated badges; removed badges for obsolete things

Signed-off-by: Bob Yantosca <yantosca@seas.harvard.edu>

docs/source/conf.py

@@ -23,7 +23,7 @@
 author = 'GEOS-Chem Support Team'
 
 # The full version, including alpha/beta/rc tags
-release = '14.2.0
+release = '14.2.0'
 
 
 # -- General configuration ---------------------------------------------------

docs/source/index.rst

@@ -4,13 +4,13 @@ GEOS-Chem High Performance
 .. raw:: html
 
    <p>
-   <a href="http://wiki.seas.harvard.edu/geos-chem/index.php/GEOS-Chem_versions"><img src="https://img.shields.io/github/v/release/geoschem/GCHP?label=Latest%20Release"></a>
+   <a href="https://github.com/geoschem/GCHP/releases"><img src="https://img.shields.io/github/v/release/geoschem/GCHP?include_prereleases&label=Latest%20Pre-Release"></a>
+   <a href="http://wiki.seas.harvard.edu/geos-chem/index.php/GEOS-Chem_versions"><img src="https://img.shields.io/github/v/release/geoschem/GCHP?label=Latest%20Stable%20Release"></a>
+   <a href="https://github.com/geoschem/GCHP/releases/"><img src="https://img.shields.io/github/release-date/geoschem/GCHP"></a><br/>
    <a href="https://zenodo.org/badge/latestdoi/200900441"><img src="https://zenodo.org/badge/200900441.svg"></a>
+   <a href="https://github.com/geoschem/GCHP/blob/main/LICENSE.txt"><img src="https://img.shields.io/badge/License-MIT-blue.svg"></a>
    <a href="https://gchp.readthedocs.io/en/latest/"><img src="https://img.shields.io/readthedocs/gchp?label=ReadTheDocs"></a>
    <a href="https://dev.azure.com/geoschem/GCHP/_build"><img src="https://img.shields.io/azure-devops/build/geoschem/GCHP/20/main?label=Build%20Matrix"></a>
-   <a href="https://hub.docker.com/r/geoschem/gchp"><img src="https://img.shields.io/docker/v/geoschem/gchp?color=blue&label=Docker%2FSingularity"></a>
-   <a href="https://spack.readthedocs.io/en/latest/package_list.html#gchp"><img src="https://img.shields.io/badge/Install%20with-Spack-ff69b4"></a>
-   <a href="https://github.com/geoschem/GCHP/releases"><img src="https://img.shields.io/github/v/release/geoschem/GCHP?include_prereleases&label=Latest%20Pre-Release"></a>
    </p>
 
 The `GEOS--Chem model <http://geos-chem.org/>`_ is a global 3-D model