Issue title: AlexyAB WebUI - TensorboardX
 Issue body: Hi,

is there a way to consult the graphs of the AlexeyAB WebUI and the TensorboardX after training? 

For now, there are only the files: yolo_events.log and yolo_events.log.1 which hold evaluation metrics.

Thank you in advance!
 Comments: 
 Comment 0: Hello, 

Unfortunately in the current version, the docker container responsible for the training is terminated at the end of the training. The training container contains both the tensorboard and the web_ui, so both are not mapped to the outside of the training container, making them unavailable at the end of the training.

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