Use $HOME variable for prefs_path in documentation

[Celestial04]

$HOME is used for completing /home/<username>/ to be like /home/celeste for example.

Summary by CodeRabbit

• Documentation
  • Updated Flatpak setup instructions to use environment variables for configuration paths. Configuration paths now dynamically adapt to your system environment instead of relying on hardcoded references, improving portability and compatibility across different system configurations.

[coderabbitai]

Walkthrough

Updated the Flatpak setup documentation to use the $HOME environment variable instead of a hardcoded /home/username path for the prefs_path configuration value, making the setup more portable across different user environments.

Changes

Cohort / File(s)	Summary
Documentation Update docs/getting-started.md	Updated Flatpak setup notes to replace hardcoded home path with $HOME environment variable for improved portability.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 A path that's hard is set in stone,
But variables help us roam back home!
With $HOME we've made it right,
Now every burrow shines so bright! 🌟

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main change: updating documentation to use the $HOME environment variable instead of hardcoded paths for the prefs_path configuration.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Merge Conflict Detection	✅ Passed	✅ No merge conflicts detected when merging into main

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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No actionable comments were generated in the recent review. 🎉

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[Celestial04]

seem good