Add more fonts to avoid errors

[JohnAZoidberg]

Fixes #213

Describe your changes
I had the following errors on my system.

findfont: Generic family 'sans-serif' not found because none of the following families were found: Helvetica, Bitstream Vera Sans, Lucida Grande, Verdana, Geneva, Lucid, Arial, Avant Garde, sans-serif
findfont: Generic family 'monospace' not found because none of the following families were found: Decima Mono, Bitstream Vera Sans Mono, Andale Mono, Nimbus Mono L, Courier New, Courier, Fixed, Terminal, monospace

I tried to install the fonts but I couldn't make it find it. So I ran the following commands and added the fonts it showed to the configuration file.

>>> import matplotlib as plt
>>> ', '.join(plt.rcParams['font.sans-serif'])
>>> ', '.join(plt.rcParams['font.monospace'])

Checklist

• Test cases have been modified/added to cover any code changes.
• Docstrings have been modified/created for any code changes.
• All linting and formatting checks pass (see the contributing guidelines for more information).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.41%. Comparing base (51b8d26) to head (d2828a2).
Report is 19 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #216      +/-   ##
==========================================
- Coverage   98.42%   98.41%   -0.01%     
==========================================
  Files          43       43              
  Lines        1775     1766       -9     
  Branches      358      357       -1     
==========================================
- Hits         1747     1738       -9     
  Misses         25       25              
  Partials        3        3              

[stefmolin]

Thanks @JohnAZoidberg!