Duplicated sphinx extension

[jorgepiloto]

🪲 About the issue

In the docs/source/conf.py there exists a duplicated extension: sphinx.ext.mathjax.

💡 Solution

Simply remove one of the two lines; we are importing twice the extension... This can be an easy issue for new GSOC aspirants to know how to proceed and the issue/pull-request workflow 🚀

[iamabhishek0]

I am working on this