docs(installation): add Debian install via the pkg.haus APT archive

[barnumbirr]

pkg.haus is a signed APT archive carrying superfile for Debian stable, testing and unstable (amd64/arm64), built from source at upstream release tags. This adds a Debian section to the installation docs and notes the binary installs as spf.

Summary by CodeRabbit

• Documentation
  • Added Debian installation instructions using the pkg.haus APT archive.
  • Clarified that the installed executable is named spf.

[github-actions]

🎉 Thank you for your first contribution to superfile!

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 9805f943-e542-4ab2-9e08-ef81d84a2c1d

📥 Commits

Reviewing files that changed from the base of the PR and between a97381e and cb3c26c.

📒 Files selected for processing (1)

• website/src/content/docs/getting-started/installation.mdx

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📝 Walkthrough

Walkthrough

The installation guide now documents Debian package installation through the pkg.haus APT archive. It covers stable, testing, and unstable releases on amd64 and arm64 systems. It also identifies the installed binary as spf.

Changes

Debian installation

Layer / File(s)	Summary
Debian APT installation instructions website/src/content/docs/getting-started/installation.mdx	Adds pkg.haus APT archive instructions, the sudo apt install superfile command, supported Debian releases and architectures, and the resulting spf binary name.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to cb3c2

This change only documents Debian installation through the pkg.haus APT archive and the resulting binary name, with no actionable merge-blocking risk remaining beyond normal checks and review.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the Debian installation documentation added through the pkg.haus APT archive.

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests

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