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/hub/inference_api.md

@@ -1,6 +1,7 @@
 ---
 comments: true
 description: Explore Ultralytics YOLOv8 Inference API for efficient object detection. Check out our Python and CLI examples to streamline your image analysis.
+keywords: YOLO, object detection, Ultralytics, inference API, RESTful API
 ---
 
 # YOLO Inference API
@@ -454,4 +455,4 @@ YOLO pose models, such as `yolov8n-pose.pt`, can return JSON responses from loca
             }
           ]
         }
-        ```
+        ```