Update histograms for latest napari-matplotlib version

[K-Meech]

For #40

This PR updates all histogram images + text to match the newest version of napari-matplotlib. In the newest version:

• The spiky histograms are fixed (now integer bins are used for integer images)
• We no longer need to change napari's theme, as the axis label colours are fixed
• The histograms now show vertical white lines at the current contrast limits

[github-actions]

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Rendered Changes

🔍 Inspect the changes: https://github.com/HealthBioscienceIDEAS/microscopy-novice/compare/md-outputs..md-outputs-PR-44

The following changes were observed in the rendered markdown documents:

 fig/coins-histogram.png   | Bin 13035 -> 14079 bytes
 fig/mitosis-histogram.png | Bin 13295 -> 13752 bytes
 fig/rgb-histogram.png     | Bin 20570 -> 20428 bytes
 image-display.md          |  17 +++++++----------
 md5sum.txt                |   4 ++--
 5 files changed, 9 insertions(+), 12 deletions(-)

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⏱️ Updated at 2024-01-26 10:06:54 +0000

[davecash75]

Looks so much better! Note a minor suggestion of red green blue in the legend of one histogram, but if that is a real pain to do, go ahead and merge as is.

[davecash75]

How easy would it be to change the legend to red green blue instead of rgb?

[K-Meech]

I just had a quick look, and there doesn't seem to be an easy way to change the legend via napari-matplotlib. Seems this would require further changes directly to the napari-matplotlib plugin - so I'll go ahead and merge for now. If adjusting the legend is something we need in future, we can always open another issue on the napari-matplotlib repo.

[davecash75]

Let's go ahead with it as now, but maybe we should open up an issue with napari-matplotlib. It doesn't need to be a blocker though.