[Docs] Revise Vizro-AI docs for dashboard generation pages

[stichbury]

Description

Changes to Vizro-AI docs to introduce dashboard generation

https://vizro--596.org.readthedocs.build/projects/vizro-ai/en/596/

Screenshot

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[maxschulz-COL]

Thanks a lot! I left some overall structuring comments that I think would help streamline this a bit. Hope it makes sense, else let's have a chat!

[lingyielia]

Left some notes and questions. Will address them later today