Fix links to setup instructions

[tobyhodges]

If this pull request addresses an open issue on the repository, please add 'Closes #NN' below, where NN is the issue number.

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Please briefly summarise the changes made in the pull request, and the reason(s) for making these changes.

The Geospatial Workshop overview site has recently been migrated to the new lesson infrastructure, which has changed the location of the setup instructions. This PR updates the relevant links within the lesson.

If any relevant discussions have taken place elsewhere, please provide links to these.

carpentries/lesson-transition#27

[github-actions]

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Rendered Changes

🔍 Inspect the changes: https://github.com/datacarpentry/r-raster-vector-geospatial/compare/md-outputs..md-outputs-PR-425

The following changes were observed in the rendered markdown documents:

 index.md   | 4 ++--
 md5sum.txt | 4 ++--
 setup.md   | 2 +-
 3 files changed, 5 insertions(+), 5 deletions(-)

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⏱️ Updated at 2023-09-20 16:23:07 +0000