Update Dockerfile to be compatible with onnxruntime-training 1.11.0 (#131)
* Create Dockerfile for onnxruntime-training 1.11.0+cu113 (unstable - gpt2 still unmatched with fp16)
* Create Dockerfile for onnxruntime-training 1.11.0+cu102 (stable)
* Add `ORTTrainer` snippet in the quickstart
* Rename Dockerfiles for onnxruntime-training 1.9.0 (stable)