Reformat Episode 4 and add instructor note

[alex-ball]

This PR adds an instructor note to Episode 4, containing a suggestion for how to adapt the review exercise when teaching the lesson over Zoom. The key differences in this approach are that the bulk of exercise is done in one large group, with everyone sharing access to a common virtual whiteboard, and it finishes off with some individual work on the same board.

Many thanks to you, @PhilReedData, for contributing the suggestion; please take a look and let me know how to improve this version of it.

In addition, this PR makes some adjustments to the regular version of the review exercise. Reading through the page again, I struggled with the logic of how the text before the 'Exercise' header related to the text after it – they seemed to be two different versions of the same thing. To straighten things out, I've used the new instructor note as inspiration and reformulated the two versions of the group work into a single challenge block: the first bullet list now reflects the order used in the Zoom version; and I've reframed the 'Visualising Git' exercise as a set of prompts or nudges for thinking about the second half of the challenge, and formatted it as a hint block. I think it works better like that.

Resolves #142.

[github-actions]

Thank you!

Thank you for your pull request 😃

🤖 This automated message can help you check the rendered files in your submission for clarity. If you have any questions, please feel free to open an issue in {sandpaper}.

If you have files that automatically render output (e.g. R Markdown), then you should check for the following:

• 🎯 correct output
• 🖼️ correct figures
• ❓ new warnings
• ‼️ new errors

Rendered Changes

🔍 Inspect the changes: https://github.com/LibraryCarpentry/lc-git/compare/md-outputs..md-outputs-PR-203

The following changes were observed in the rendered markdown documents:

 04-review.md | 39 ++++++++++++++++++++++++++++++++++-----
 md5sum.txt   |  2 +-
 2 files changed, 35 insertions(+), 6 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.

⏱️ Updated at 2026-04-16 15:56:02 +0000

[PhilReedData]

Looks great to me, well done and thank you