gh-398: consistent plotting for notebooks

[paddyroddy]

Closes #398. Adds a .matplotlibrc to stabilise the production of plots. For more detail on the config file, look at https://matplotlib.org/stable/users/explain/customizing.html#the-matplotlibrc-file. I haven't used a stylesheet (plt.style.use), as (except for classic) they don't define the resolution etc. https://github.com/matplotlib/matplotlib/tree/main/lib/matplotlib/mpl-data/stylelib.

I did run the notebooks, but they must be using these current values.

[paddyroddy]

@ntessore I've added matplotlibrc symlink to both folders instead

[ntessore]

Thanks @paddyroddy, I think this is a nice and clean solution!

I did run the notebooks, but they must be using these current values.

This surprised me, so I had a look. I guess you used our noxfile ... where we forgot to add the --inplace flag to the jupyter execute so that the execution actually changes the notebooks! At the moment, the notebooks run, but their outputs aren't stored anywhere (and our examples' HTML artefacts therefore never change). That's on me, I should have picked up on it in #367.

[paddyroddy]

Thanks @paddyroddy, I think this is a nice and clean solution!

I did run the notebooks, but they must be using these current values.

This surprised me, so I had a look. I guess you used our noxfile ... where we forgot to add the --inplace flag to the jupyter execute so that the execution actually changes the notebooks! At the moment, the notebooks run, but their outputs aren't stored anywhere (and our examples' HTML artefacts therefore never change). That's on me, I should have picked up on it in #367.

No, I ran them manually and verified it worked by changing the top level .matplotlibrc