Simpler solution for wellplate exercise

[JeremyPike]

This PR contains a couple minor suggestions and a simpler solution to the wellplate exercise which uses np.loadtxt() to load the .txt file containing the well coordinates. In my experience this has been much easier for learners to understand. Let me know what you think :)

[github-actions]

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Rendered Changes

🔍 Inspect the changes: https://github.com/datacarpentry/image-processing/compare/md-outputs..md-outputs-PR-323

The following changes were observed in the rendered markdown documents:

 02-image-basics.md   | 10 +++++-----
 03-skimage-images.md |  2 ++
 04-drawing.md        | 26 +++++++++++++++-----------
 md5sum.txt           |  6 +++---
 4 files changed, 25 insertions(+), 19 deletions(-)

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⏱️ Updated at 2024-04-30 15:01:19 +0000

[JeremyPike]

For consistency with the rest of the material

[uschille]

Thank you for this pull request @JeremyPike - 👍 for np.loadtxt from me