Feat: completion example on next-openai

[stylessh]

Completion example page added on next-openai example.

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Latest commit: 5a6e77810937cebb4040aed49b396b28cf87a571

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[stylessh]

Merged current changes on main to PR, request to run checks again

[MaxLeiter]

hey @stylessh, thanks for the contribution!

I think we should focus on expanding the docs instead of live examples because they introduce a greater maintenance burden (dependencies, etc). Would you mind writing up a quick tutorial similar to the existing ones?

[stylessh]

Sure, sounds good