Update checkout.md to include AMY link

[hnorton613]

Added the AMY portal link to the "Get Involved" step for clarification on where to go.

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[github-actions]

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Rendered Changes

🔍 Inspect the changes: https://github.com/carpentries/instructor-training/compare/md-outputs..md-outputs-PR-1656

The following changes were observed in the rendered markdown documents:

 checkout.md | 2 +-
 md5sum.txt  | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

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⏱️ Updated at 2024-06-04 15:40:59 +0000

[brownsarahm]

I would like to improve the link format to be more accessible

[ndporter]

Requesting confirmation from @sheraaronhurt or @ErinBecker that this accurately reflects what new instructor trainees will experience before merging. Thanks!