Add learner profiles content for workbench template

[jcohen02]

This PR addresses issue #225 relating to the target audience for the lesson:

• Adds a top-level "Target audience" box on the lesson intro page providing a brief note on the target audience.
• Copies the learner profiles content from the instructor notes section to the new learner profiles page in the workbench template.
• Adds some introductory text around the profiles content to ensure this is aimed at learners rather than instructors.

Closes #225

[github-actions]

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Rendered Changes

🔍 Inspect the changes: https://github.com/carpentries-incubator/docker-introduction/compare/md-outputs..md-outputs-PR-244

The following changes were observed in the rendered markdown documents:

 index.md            | 18 ++++++++++
 learner-profiles.md | 98 +++++++++++++++++++++++++++++++++++++++++++++++++++--
 md5sum.txt          |  4 +--
 3 files changed, 116 insertions(+), 4 deletions(-)

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⏱️ Updated at 2024-08-05 09:38:12 +0000

[aturner-epcc]

This looks really good @jcohen02 . I'll merge it now.