Update Isaac Powerpack extension metadata (#62)

Isaac Powerpack project repository has been moved from bemunin to
isaac-powerpack github organization. I update all changed urls in both
README.md and extensions.json

Author: bemunin

README.md

@@ -22,7 +22,7 @@ Foxglove under the extension settings.
 - [Blank Panel](https://github.com/foxglove/blank-panel-extension) – Add a little space to your layout
 - [Depth RVL Decoder](https://github.com/makeecat/foxglove-depth-rvl) - Foxglove schema converter that turns RVL compressed depth images into sensor_msgs/Image depth frames.
 - [H264 Video Playback](https://github.com/codewithpassion/foxglove-studio-h264-extension) - Experimental H264 video playback
-- [Isaac Powerpack](https://github.com/bemunin/isaac-powerpack) – A collection of tools for visualizing and debugging Isaac ROS data
+- [Isaac Powerpack](https://github.com/isaac-powerpack/isaac-powerpack) – A collection of tools for visualizing and debugging Isaac ROS data
 - [Joint State Publisher](https://github.com/rogy-ken/foxglove-joint-state-publisher) - Publish joint state with slider UI.
 - [Joystick/gamepad control](https://github.com/joshnewans/foxglove-joystick) - Receive/monitor/generate joystick and gamepad controls
 - [LogMessageViewer Panel](https://github.com/flypyka/foxglove-extensions) - Displays any foxglove.Log messages received during the entire displayed timeline.

extensions.json

@@ -555,16 +555,18 @@
     "name": "isaac-powerpack",
     "description": "A collection of tools for visualizing and debugging Isaac ROS data",
     "publisher": "bemunin",
-    "homepage": "https://github.com/bemunin/isaac-powerpack",
-    "readme": "https://raw.githubusercontent.com/bemunin/isaac-powerpack/main/README.md",
-    "changelog": "https://raw.githubusercontent.com/bemunin/isaac-powerpack/main/CHANGELOG.md",
+    "homepage": "https://github.com/isaac-powerpack",
+    "readme": "https://raw.githubusercontent.com/isaac-powerpack/isaac-powerpack/main/README.md",
+    "changelog": "https://raw.githubusercontent.com/isaac-powerpack/isaac-powerpack/main/packages/isaac-powerpack/CHANGELOG.md",
     "license": "Apache 2.0",
     "version": "0.0.1",
     "sha256sum": "6dded815563a11b2c43e9c02efe548bb2142facb0252d92b5763450a88a5a4d9",
-    "foxe": "https://github.com/bemunin/isaac-powerpack/releases/download/v0.0.1/bemunin.isaac-powerpack-0.0.1.foxe",
+    "foxe": "https://github.com/isaac-powerpack/isaac-powerpack/releases/download/v0.0.1/bemunin.isaac-powerpack-0.0.1.foxe",
     "keywords": [
+      "ros2",
       "isaac-ros",
-      "isaac-sim"
+      "isaac-sim",
+      "jetson"
     ]
   }
 ]