Documentation: Explain migrations from other databases

[macjuul]

Description

This is a broad topic, however it deserves attention. While we have "SurrealDB for ..." pages describing conceptual differences, they should be extended to describe the approach on migrating data into SurrealDB, and potentially how to remodel this data to conform to SurrealDB's best practises.

Some questions that readers may have include

• Should I use record links or RELATE to describe relations in my existing data
• How does authentication compare to my previous database
• How do I translate a relational database into a graph structure

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• I have searched the existing issues

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