docs: fix broken Tutorial link under Next Steps

[Devkhunger]

What this PR does

Fixes the broken Tutorial link under the Next Steps section of the Refine Core documentation.

The link previously pointed to:

/core/tutorial

It now points to:

/core/tutorial/essentials/intro/

Fixes #7608

Testing

Verified that the updated Tutorial link points to the correct tutorial introduction route.

[changeset-bot]

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Latest commit: 8741d71

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