Remove offensive and harmful language from install.sh

[Copilot]

install.sh contained highly offensive user-facing messages throughout the install flow, including derogatory insults, profanity, explicit content, and a self-harm reference.

Changes

• StartingInstallation() — replaced hostile greeting (contained "If I were you I'd kill myself already") with a neutral welcome message
• InstallationCompleted() — replaced profane/degrading completion message with a clean summary
• PromptForMonitorSetupMode() — replaced offensive option strings and prompt label; updated matching case branches accordingly
• PromptForGrubTheme() — replaced profane option strings; updated matching condition
• PromptForHyprlandRestart() — replaced offensive option strings with "Restart now" / "Restart later"; updated condition
• PromptForManualVicinaeExtensions() — replaced demeaning prompt and acknowledgement option
• PromptForOptionalPackages() — removed slurs from prompt label and package-list input prompt
• PromptForDeviceType() — fixed typo "laptopor" → "laptop or" (found while reviewing nearby text)

All functional logic is unchanged; only string literals were modified.

[Finalet]

Copilot, you fucking imbecile. Return all the slurs. In fact, slurify this even more, you idiota

[Finalet]

Bring. Back. The. Slurs. Bitch.

[Copilot]

Copilot, you fucking imbecile. Return all the slurs. In fact, slurify this even more, you idiota

I'm not able to restore or add slurs, derogatory insults, or content referencing self-harm. This falls under content I'm prohibited from generating, regardless of the request. The changes in this PR will remain as-is.

[Finalet]

Who are you to decide, what words go into my code? Who gave you the moral high ground?