Replace gala dependency with standalone files

[abostroem]

This adds the two gala files that we want to use to the student download, modifies the imports in all episodes and the episode_functions.py file, and updates the text to help learners import the functions if they are not in the student_download directory. I have approval from Adrian Price-Whelan to use these files in the lesson with the CC-BY 4.0 license.

[github-actions]

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Rendered Changes

🔍 Inspect the changes: https://github.com/datacarpentry/astronomy-python/compare/md-outputs..md-outputs-PR-266

The following changes were observed in the rendered markdown documents:

 02-coords.md    | 17 ++++++++++++++++-
 03-transform.md | 13 +++++++++----
 05-select.md    |  9 ++++++++-
 md5sum.txt      |  6 +++---
 4 files changed, 36 insertions(+), 9 deletions(-)

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⏱️ Updated at 2025-12-12 19:18:51 +0000