Consistent layer numbering for filetypes and metadata

[thompson318]

Addressing #102

[github-actions]

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Rendered Changes

🔍 Inspect the changes: https://github.com/HealthBioscienceIDEAS/microscopy-novice/compare/md-outputs..md-outputs-PR-126

The following changes were observed in the rendered markdown documents:

 filetypes-and-metadata.md | 38 +++++++++++++++++++-------------------
 md5sum.txt                |  2 +-
 2 files changed, 20 insertions(+), 20 deletions(-)

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⏱️ Updated at 2026-06-08 13:57:17 +0000

[K-Meech]

Thanks @thompson318 - looks good. I think the 0/1/2 numbering is much clearer 😄

Spotted a few remaining references to image layer 3 below:

[K-Meech]

Thanks @thompson318 - all looks good to me!