website: Update video link, update video banner

[tomtseng]

• Old video link broke, so we replace it with a new one
• The video is different, so we make a new screenshot
  • Took a screenshot of Tony pointing at a no-text slide. The slides were originally on the right half of the screen, but I edited the screenshot to move the slides to the left so that Tony's pointing makes more visual sense
• Remove large header text that says "Come find us at ICML 2023"

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