No plots in report with nbconvert 7.0

[desilinguist]

This is a bug in nbconvert: jupyter/nbconvert#1849.

Workaround: downgrade nbconvert to 6.5.0 until the upstream is fixed.

[desilinguist]

This seems to have been fixed upstream and the stable branch is now passing again.

[desilinguist]

This is not really fixed as the plots are basically black canvases like below:

I am going to reopen this issue. The workaround is still to downgrade nbconvert to 6.5.0 until the Jupyter folks fix the issue upstream.

Note that the actual plot files under figure are still produced correctly. It's just an issue with the HTML report.

[desilinguist]

I really didn't want to pin nbconvert to 6.5.0 since I was worried about that version being phased esp. for newer Python versions. So, I figured out a way to achieve the relevant behavior from 6.5.0 with the latest version of nbconvert. See this upstream comment that I made on how to achieve this.

[desilinguist]

Addressed by #575.