Docs updates for HUB, YOLOv4, YOLOv7, NAS (#3174)

Co-authored-by: Glenn Jocher <glenn.jocher@ultralytics.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

docs/datasets/pose/coco.md

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 description: Learn about the COCO-Pose dataset, designed to encourage research on pose estimation tasks with standardized evaluation metrics.
+keywords: COCO-Pose, COCO dataset, pose estimation, keypoints detection, computer vision, deep learning, YOLOv8n-pose, dataset configuration
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 # COCO-Pose Dataset

docs/datasets/pose/coco8-pose.md

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 description: Test and debug object detection models with Ultralytics COCO8-Pose Dataset - a small, versatile pose detection dataset with 8 images.
+keywords: coco8-pose dataset, ultralytics, object detection, pose detection, yolo, hub
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 # COCO8-Pose Dataset

docs/datasets/pose/index.md

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 comments: true
 description: Learn how to format your dataset for training YOLO models with Ultralytics YOLO format using our concise tutorial and example YAML files.
+keywords: pose estimation, datasets, supported formats, YAML file, object class index, keypoints, ultralytics YOLO format
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 # Pose Estimation Datasets Overview