Link to relative URLs from README

[bencomp]

Closes #312 by using relative links. These work in cloned repositories as well as on GitHub.

[github-actions]

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🔍 Inspect the changes: https://github.com/LibraryCarpentry/lc-open-refine/compare/md-outputs..md-outputs-PR-313

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⏱️ Updated at 2023-09-01 12:07:31 +0000

[jas58]

Thank you, @bencomp