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

tldr/yolo

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# yolo
+
+> The YOLO command-line interface lets you simply train, validate or infer models on various tasks and versions.
+> More information: <https://docs.ultralytics.com/cli/>.
+
+- Create a copy of the default configuration in your current working directory:
+
+`yolo task=init`
+
+- Train the object detection, instance segment, or classification model with the specified configuration file:
+
+`yolo task={{detect|segment|classify}} mode=train cfg={{path/to/config.yaml}}`