Fix repo links in index

[jcohen02]

I wasn't sure if these links were left incomplete intentionally (i.e. because individuals should update them with the relevant links when they create a fork?) however, I decided it made sense to have these set to the correct locations for the reference repository.

Feel free to reject this PR if things were set up like this intentionally.

[github-actions]

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🔍 Inspect the changes: https://github.com/carpentries-incubator/docker-introduction/compare/md-outputs..md-outputs-PR-243

The following changes were observed in the rendered markdown documents:

 creating-container-images.md | 5 ++++-
 md5sum.txt                   | 4 ++--
 2 files changed, 6 insertions(+), 3 deletions(-)

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⏱️ Updated at 2024-08-04 20:26:59 +0000

[jcohen02]

I'm not sure what's going on here but I note that the links I've replaced here are actually defined in _includes/links.md but for some reason they're not being rendered on my local deployment - I think this PR may be redundant....

[jcohen02]

An update on the previous comment - it looks like the _includes directory is probably a left-over from the previous Jekyll template that this lesson was using. Moving links.md to the top level of the repo as noted in the docs solves the problem and global "named" links in this file are now visible across lesson files.

There was also an error being generated with the link [R] in the advanced containers episode - links with a single character are not valid. This has been resolved by instead referring to the "R programming language".

[aturner-epcc]

LGTM