Add callout about redesign

[chennesy]

The PR adds a callout to the homepage of the lesson to note that the lesson will be replaced in early 2024.

[github-actions]

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Rendered Changes

🔍 Inspect the changes: https://github.com/LibraryCarpentry/lc-python-intro/compare/md-outputs..md-outputs-PR-111

The following changes were observed in the rendered markdown documents:

 index.md   | 4 ++++
 md5sum.txt | 2 +-
 2 files changed, 5 insertions(+), 1 deletion(-)

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⏱️ Updated at 2023-11-06 15:36:59 +0000