Update histograms for latest napari-matplotlib version

[K-Meech]

For https://github.com/HealthBioscienceIDEAS/microscopy-novice/issues/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[bot]]

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Rendered Changes

:mag: 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(-)

What does this mean?

If you have source files that require output and figures to be generated (e.g. R Markdown), then it is important to make sure the generated figures and output are reproducible. This output provides a way for you to inspect the output in a diff-friendly manner so that it's easy to see the changes that occur due to new software versions or randomisation.

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

[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.