remove dead code

[presto8]

Three functions were defined but never called from main() or anywhere
else:

mute() -- an unused &>/dev/null wrapper.
disable_if_installed() -- also buggy: it looped over "$@" binding
each unit to $unit, then passed "$@" (the
whole list) to 'systemctl list-unit-files',
so the existence check never corresponded to
the unit being disabled. disable_service()
already covers this and is the one actually
used.
auto_start_terminal() -- along with startup-terminal.desktop, its
only consumer.

Verified each name appears exactly once in the file (its own
definition) before removal, and that nothing else references
startup-terminal.desktop. All three are recoverable from history if
wanted.

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🤖 Generated with Claude Code

[Copilot]

🟢 Approval recommended

The changes are limited to removing unreferenced code/assets and do not affect any remaining call paths.

Pull request overview

This PR removes unused autostart and systemd helper code from the setup script, along with its unused .desktop file, reducing maintenance surface without changing executed behavior.

Changes:

• Deleted three unused shell functions from setup: mute(), disable_if_installed(), and auto_start_terminal().
• Removed the unused autostart entry file startup-terminal.desktop.

File summaries

File	Description
setup	Removes dead, unreferenced helper functions to simplify the installer script.
startup-terminal.desktop	Deletes an unused autostart desktop entry that no longer has any consumer.

Review details

• Files reviewed: 2/2 changed files
• Comments generated: 0
• Review effort level: Lite

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