Move pages under tldr, lint run.sh, update docs

tldr/accelerate

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# Accelerate
+
+> A library that enables the same PyTorch code to be run across any distributed configuration.
+> More information: <https://huggingface.co/docs/accelerate/index>.
+
+- Print environment information:
+
+`accelerate env`
+
+- Interactively create a configuration file:
+
+`accelerate config`
+
+- Print the estimated GPU memory cost of running a Hugging Face model with different data types:
+
+`accelerate estimate-memory {{name/model}}`
+
+- Test an Accelerate configuration file:
+
+`accelerate test --config_file {{path/to/config.yaml}}`
+
+- Run a model on CPU with Accelerate:
+
+`accelerate launch {{path/to/script.py}} {{--cpu}}`
+
+- Run a model on multi-GPU with Accelerate, with 2 machines:
+
+`accelerate launch {{path/to/script.py}} --multi_gpu --num_machines 2`