Add more arguments, fix icons URL and config copy

Add -h/--hide-titles, giving the user the option of hiding window titles from workspace names Add -c/--config, allowing users to provide a custom config path Change default config path to xdg_config_home + "/i3-workspace-names", to avoid making any assumption about the user's environment Fix Font Awesome icons' URL to the most recent one Fix copying the sample config to a non-existent directory, by creating all missing directories from the path