feat: Turned keypoints in intro into sentences

[Scottan]

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Rendered Changes

🔍 Inspect the changes: https://github.com/UoMResearchIT/programming_with_python/compare/md-outputs..md-outputs-PR-86

The following changes were observed in the rendered markdown documents:

 01-introduction.md | 12 +++++++-----
 md5sum.txt         |  2 +-
 2 files changed, 8 insertions(+), 6 deletions(-)

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⏱️ Updated at 2026-04-21 11:28:11 +0000

[andrewgait]

Looks good to me - approved.