[Docs] Update example for advanced charts with Vizro-AI

[nadijagraca]

Description

• Update example and relevant images/gif for advanced chart examples with vizro-ai
• Update gifs for chart examples

Screenshot

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[stichbury]

Nice changes, thank you! Just a few minor comments. I think we'll be able to merge this set of updates easily with the changes in #596 since I've hardly touched this page. I'd suggest you merge first, but let's see how the timing works out!