[Docs] Prepare docs for refactoring

[maxschulz-COL]

Description

• sharp eyes definitely needed as I will 100% have forgotten something 😬
• also noted the first performance decrease compared to the previous iteration: the prompt in the chart tutorial for the line chart of GDP over the years (around line 72) works without the extra statement about taking the average in the previous version --> can anyone find similar cases?

Screenshot

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[maxschulz-COL]

@nadijagraca Could you maybe exchange the gif 🙏

[stichbury]

LGTM with a few comments left for readability but nothing else.

Did you look at https://github.com/McK-Internal/vizro-internal/issues/1173 and have you covered any of the comments you raised previously about docs structure with this PR? If so, please feel free to close it!

[lingyielia]

As we discussed, dashboard is not compatible with other vendors yet. Otherwise LGTM!

[nadijagraca]

Looks good to me. I didn't have trouble following the instructions and replicating the examples. ⭐