Fix plugin uninstall command and CLI help inconsistency

[saulob]

This PR fixes an inconsistency between the CLI and the documentation for plugin removal

Currently:

• The CLI help shows inkypi plugin remove <plugin_id>
• The wiki documents inkypi plugin uninstall <plugin_id>
• The router already supports uninstall, but the usage text and comments still reference remove

Changes:

• Update CLI usage text from remove to uninstall
• Update comments from REMOVE to UNINSTALL
• Align CLI with documented command

Result:

• CLI help now correctly reflects the actual supported command
• Consistency between CLI and documentation

Testing:

• Verified that inkypi plugin shows uninstall in help
• Successfully installed and uninstalled a plugin using:
  inkypi plugin install mini_weather <repo_url>
  inkypi plugin uninstall mini_weather

[Copilot]

Pull request overview

This PR aligns the inkypi plugin CLI help text and section header comments with the already-supported uninstall command, resolving the documented mismatch between “remove” and “uninstall”.

Changes:

• Updated CLI usage output to show inkypi plugin uninstall <plugin_id> instead of remove.
• Renamed the uninstall section header comment from # REMOVE to # UNINSTALL.

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