Update and tidy up Instructor Notes

[alex-ball]

This PR tackles a set of issues with the Instructor Notes page:

• Removes unnecessary horizontal lines and <h1> headings, and tweaks the order to match better with the (very similar) Software Carpentry git-novice Instructor Notes.
• Updates the outdated links.
• Replaces link texts that are unsatisfactory from an accessibility standpoint (URLs, "this") with more specific and descriptive texts.
• Rewords the paragraph on line endings for a more logical flow, and adds the tip from Software Carpentry for resetting working directories with mixed line endings.

[github-actions]

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 instructor-notes.md | 60 ++++++++++++++++++++++-------------------------------
 md5sum.txt          |  2 +-
 2 files changed, 26 insertions(+), 36 deletions(-)

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⏱️ Updated at 2026-03-31 10:43:43 +0000