fix challenge formatting

[alee]

also adjusted a discussion in episode 4:

Original:

Updated:

closes #136

[github-actions]

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🔍 Inspect the changes: https://github.com/carpentries-lab/good-enough-practices/compare/md-outputs..md-outputs-PR-138

The following changes were observed in the rendered markdown documents:

 04-collaboration.md        |  2 +-
 05-project_organization.md | 36 +++++++++++++++++++-----------------
 md5sum.txt                 |  4 ++--
 3 files changed, 22 insertions(+), 20 deletions(-)

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⏱️ Updated at 2023-09-23 21:22:38 +0000