docs: Include badges in ReadTheDocs

Include the badges from the README in the index page of our
documentation so this information is visible on ReadTheDocs in addition
to GitHub and PyPI.

Closes #81.

doc/source/index.rst

@@ -10,6 +10,43 @@ reverse_argparse
    examples
    reference
 
+|Code Style: black|
+|codecov|
+|Continuous Integration|
+|Contributor Covenant|
+|Documentation Status|
+|Linting: Pylint|
+|OpenSSF Best Practices|
+|pre-commit|
+|pre-commit.ci Status|
+|PyPI Version|
+|Python Version|
+|Security: Bandit|
+
+.. |Code Style: black| image:: https://img.shields.io/badge/Code%20Style-black-000000.svg
+   :target: https://github.com/psf/black
+.. |codecov| image:: https://codecov.io/gh/sandialabs/reverse_argparse/branch/master/graph/badge.svg?token=FmDStZ6FVR
+   :target: https://codecov.io/gh/sandialabs/reverse_argparse
+.. |Continuous Integration| image:: https://github.com/sandialabs/reverse_argparse/actions/workflows/continuous-integration.yml/badge.svg
+   :target: https://github.com/sandialabs/reverse_argparse/actions/workflows/continuous-integration.yml
+.. |Contributor Covenant| image:: https://img.shields.io/badge/Contributor%20Covenant-2.1-4baaaa.svg
+   :target: CODE_OF_CONDUCT.md
+.. |Documentation Status| image:: https://readthedocs.org/projects/reverse-argparse/badge/?version=latest
+   :target: https://reverse-argparse.readthedocs.io/en/latest/?badge=latest
+.. |Linting: Pylint| image:: https://img.shields.io/badge/Linting-Pylint-yellowgreen
+   :target: https://github.com/pylint-dev/pylint
+.. |OpenSSF Best Practices| image:: https://bestpractices.coreinfrastructure.org/projects/7632/badge
+   :target: https://bestpractices.coreinfrastructure.org/projects/7632
+.. |pre-commit| image:: https://img.shields.io/badge/pre--commit-enabled-brightgreen?logo=pre-commit
+   :target: https://github.com/pre-commit/pre-commit
+.. |pre-commit.ci Status| image:: https://results.pre-commit.ci/badge/github/sandialabs/reverse_argparse/master.svg
+   :target: https://results.pre-commit.ci/latest/github/sandialabs/reverse_argparse/master
+.. |PyPI Version| image:: https://badge.fury.io/py/reverse-argparse.svg
+   :target: https://badge.fury.io/py/reverse-argparse
+.. |Python Version| image:: https://img.shields.io/badge/Python-3.8|3.9|3.10|3.11|3.12-blue.svg
+.. |Security: Bandit| image:: https://img.shields.io/badge/Security-Bandit-yellow.svg
+   :target: https://github.com/PyCQA/bandit
+
 The ``reverse_argparse`` module provides a means of undoing the argument
 parsing provided by :mod:`argparse`.  That is, it can take a
 :class:`argparse.Namespace` of parsed command line arguments, along with the