replace deprecated cartopy property on notebook

[Mikejmnez]

The goal of this PR is to close #310 . This PR accomplishes the following:

• [x] Replace background_patch with patch on Particles.ipynb notebook.
• [x] Update documentation (make html)
• [x] Replace xlabels_top by top_label and ylabels_right by right_labels on ospy.plot.horizontal_section().
• [ ] Asses whether to set add_labels=True as default argument in od.plot.horizontal_section (and best way to do this), or to simply manually pass it as argument everytime one makes an horizontal section via od.plot module (for example, see cell 7 in https://oceanspy.readthedocs.io/en/latest/Kogur.html. Running this notebook as is on Sciserver does not plot the axis ticks nor labels).

[codecov[bot]]

Codecov Report

Merging #311 (5d55302) into main (b7fd442) will not change coverage. The diff coverage is 0.00%.

@@           Coverage Diff           @@
##             main     #311   +/-   ##
=======================================
  Coverage   95.74%   95.74%           
=======================================
  Files           9        9           
  Lines        3928     3928           
  Branches      850      850           
=======================================
  Hits         3761     3761           
  Misses         97       97           
  Partials       70       70           

Flag	Coverage Δ
unittests	95.74% <0.00%> (ø)

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Impacted Files	Coverage Δ
oceanspy/plot.py	97.52% <0.00%> (ø)

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[Mikejmnez]

I wasn't finished. Still missing a task (see first comment).

But these are minor issues with plotting and labels (ticks) not appearing unless add_labels is set True manually as an argument intood.plot.horizontal_section()

[ThomasHaine]

Doh! Sorry about jumping the gun.