Reorganize further reading and example repositories

[alex-ball]

This PR addresses some of the issues with the resources listed in learners/reference.md:

• It moves the diverse collection of git repositories to after the list of further reading into using git, as I think that makes a more logical progression.

• It moves the Code4Lib 2008 slides to the further reading section (it is not an example of a GitHub repository);

• It moves the Programming Historian collection of lessons to the Git repositories section (it is an example of a git repository and GitHub Pages site, but only one of its 117 lessons is further reading about Git).

• Some of the git repositories are listed as bare links, with no hint of their library or lesson relevance apart from the name, and some of the links in the git repository section are links to rendered resources where you have to do some detective work to find the actual git repository where it is maintained. In this proposal, each GitHub (or GitLab) repository is presented in the following format:

  • Link to repository: Description of resource.
    • Rendered or visualized version: Link

I have not added or removed any resources, and I have left alone the question of whether the resources in each list could be placed in a better order.

Closes #187.

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Rendered Changes

🔍 Inspect the changes: https://github.com/LibraryCarpentry/lc-git/compare/md-outputs..md-outputs-PR-193

The following changes were observed in the rendered markdown documents:

 md5sum.txt   |  2 +-
 reference.md | 47 +++++++++++++++++++++++++++--------------------
 2 files changed, 28 insertions(+), 21 deletions(-)

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⏱️ Updated at 2025-11-20 17:07:10 +0000

[srerickson]

looks good to me!