docs: make astra vectorize provider key advanced param

[jordanrfrazier]

Makes the astra vectorize provider key an advanced parameter, as the recommended workflow currently has users storing the key in Astra KMS.

This key would only be used when a user creates the collection via LC or the Data API directly, then uses Langflow with that collection. This is possible, and we're working on ways to simplify that transition, but for now, this is more understandable for users.

[github-actions]

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_{Last Modified at 11 Jul 24 16:37 UTC}

[ogabrielluiz]

LGTM