Update docs + readthedocs

#49
* Doc requirements
* sphinx-rtd-theme
* Use add_stylesheet (add_stylesheet is deprecated)
* Doc: Temporarily disable cython_highlighting extension (patch TypeError: 'CythonLexer' object is not callable)
* Update requirements.txt
* Update CHANGELOG
* Update README.md

Update docs + readthedocs

#49
* Doc requirements
* sphinx-rtd-theme
* Use add_stylesheet (add_stylesheet is deprecated)
* Doc: Temporarily disable cython_highlighting extension (patch TypeError: 'CythonLexer' object is not callable)
* Update requirements.txt
* Update CHANGELOG
* Update README.md

Updating readthedocs

* Refreshing docs  (#47)

Python 3.12

+ Python 3.12
+ Update Readme

Update README.rst

Merge pull request #13 from riverbed/test-plans

Fix IsAlive deprecated

Update Changelog