* Update Comet preview image

Pass through tinyjpg: 2.2MB -> 497kB :)
Signed-off-by: Glenn Jocher <glenn.jocher@ultralytics.com>

* Update tutorial.ipynb
Signed-off-by: Glenn Jocher <glenn.jocher@ultralytics.com>

* Update tutorial.ipynb
Signed-off-by: Glenn Jocher <glenn.jocher@ultralytics.com>

* Update tutorial.ipynb
Signed-off-by: Glenn Jocher <glenn.jocher@ultralytics.com>

* Update README.md
Signed-off-by: Glenn Jocher <glenn.jocher@ultralytics.com>
Signed-off-by: Glenn Jocher <glenn.jocher@ultralytics.com>