Completely deletes an existing theme. This command will delete your theme from the "themes" folder and remove the corresponding entry from the "theme_config" declaration in your
plenti.json file. You can perform these actions manually to achieve the same result.
Note: This will not disable your theme if you are removing a theme that is currently in use. You need to do that separately to avoid breaking your build.
Remove a theme completely from your project with
plenti theme remove THEME_FOLDER_NAME.