Enable rich rendering of Jupyter notebooks in Bitbucket Server

Original description:
Github now supports rich rendering of jupyter notebooks:

https://github.com/blog/1995-github-jupyter-notebooks-3

And Bitbucket (cloud version) seems to also support it now. Jupyter notebooks are increasingly used as a format for documentation, sharing computations, and reproducible data science in general.

The problem is that there's no support for this yet in Bitbucket Server. There's a plugin out there, but it is not very good, it can only render some notebooks, many of them render just as a blank page. Also, its LaTeX/MathJax support seems to be defective, equations are being displayed as raw LaTeX.

Note that GitHub has over 650000 notebooks shared on their website. This format is clearly becoming mainstream.