Simple QoL Commands

Added 2 new commands:

• "/back":
  Usage: /back
  Teleports the executor to the place where they last teleported, or to their last death location (only if enable-back-command-on-death was set to true).

• "/warp":
  Usage: /warp <warp_name/create/remove>
  Similar to /home, but is managed by the server's admins.

Added config.yml to the plugin's folder to manage the settings.