Further warnings in rm exercise

[martinosorb]

Fixes #965, additionally removing a 'just' and clarifying we don't want to remove the whole subdirectory.

[github-actions]

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🤖 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:

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• ❓ new warnings
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Rendered Changes

🔍 Inspect the changes: https://github.com/swcarpentry/git-novice/compare/md-outputs..md-outputs-PR-992

The following changes were observed in the rendered markdown documents:

 03-create.md | 7 ++++---
 md5sum.txt   | 2 +-
 2 files changed, 5 insertions(+), 4 deletions(-)

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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.

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⏱️ Updated at 2024-07-02 15:34:41 +0000

[erinmgraham]

Challenge now notes rm is irreversible.