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/reference/yolo/nas/model.md

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+---
+description: Learn about the Neural Architecture Search (NAS) feature available in Ultralytics YOLO. Find out how NAS can improve object detection models and increase accuracy. Get started today!.
+keywords: Ultralytics YOLO, object detection, NAS, Neural Architecture Search, model optimization, accuracy improvement
+---
+
+# NAS
+---
+:::ultralytics.yolo.nas.model.NAS
+<br><br>

docs/reference/yolo/nas/predict.md

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+---
+description: Learn how to use NASPredictor in Ultralytics YOLO for deploying efficient CNN models with search algorithms in neural architecture search.
+keywords: Ultralytics YOLO, NASPredictor, neural architecture search, efficient CNN models, search algorithms
+---
+
+# NASPredictor
+---
+:::ultralytics.yolo.nas.predict.NASPredictor
+<br><br>

docs/reference/yolo/nas/val.md

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+---
+description: Learn about NASValidator in the Ultralytics YOLO Docs. Properly validate YOLO neural architecture search results for optimal performance.
+keywords: NASValidator, YOLO, neural architecture search, validation, performance, Ultralytics
+---
+
+# NASValidator
+---
+:::ultralytics.yolo.nas.val.NASValidator
+<br><br>