fix broken link for Pandoc documentation

[edbennett]

The link in the introduction episode template to the Pandoc manual 404s, as they don't (any more, at least) have a .txt version of this on their website. This PR updates that to the HTML version, which resolves correctly.

[github-actions]

Thank you!

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🤖 This automated message can help you check the rendered files in your submission for clarity. If you have any questions, please feel free to open an issue in {sandpaper}.

If you have files that automatically render output (e.g. R Markdown), then you should check for the following:

• 🎯 correct output
• 🖼️ correct figures
• ❓ new warnings
• ‼️ new errors

Rendered Changes

🔍 Inspect the changes: https://github.com/carpentries/workbench-template-md/compare/md-outputs..md-outputs-PR-55

The following changes were observed in the rendered markdown documents:

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

What does this mean?

If you have source files that require output and figures to be generated (e.g. R Markdown), then it is important to make sure the generated figures and output are reproducible.

This output provides a way for you to inspect the output in a diff-friendly manner so that it's easy to see the changes that occur due to new software versions or randomisation.

⏱️ Updated at 2025-01-03 16:09:43 +0000

[ErinBecker]

Thank you @edbennett!