Update Prisma Postgres guide to use @prisma/adapter-pg adapter

[AmanVarshney01]

Updates the Prisma Postgres guide to use @prisma/adapter-pg adapter instead of Accelerate extension for direct TCP connections. Reorganizes connection methods into two clear sections: Prisma ORM (recommended) and other ORMs/libraries.

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[sarah11918]

Hi @AmanVarshney01 ! Can you let me know why you are proposing this change, and whether the existing content is incorrect, or whether this is just a preference?