Update instructions to use conda export rather than conda env export

[andrewgait]

Resolves #85

The updated text also includes an example of writing direct to a YAML file.

[github-actions]

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 04-software_package_management.md | 9 +++++----
 md5sum.txt                        | 2 +-
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⏱️ Updated at 2026-04-22 10:38:17 +0000

[Scottan]

See inline comments

[Scottan]

Looks good to me - approved