Added NoSQL callout (#343)

[adamancer]

Adds brief discussion of NoSQL. Closes #343.

[github-actions]

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⏱️ Updated at 2024-01-09 17:13:59 +0000

[jd-foster]

Hey Adam, apologies for the delay on getting to this. Thanks for writing this clear explanation, I think it answers a question people often have.
I wonder if this might be a bit of an overload to put in the introduction - I do note that there is a proposed database design discussion that this could be a really useful addition to.