feat: revised pooling docs

[luanvdw]

Consolidate connection docs into two pages.

Merged three pages ("Connecting to your database," "Connection pooling," "Direct connections") into two. The split caused an unclear entry point for first-time setup and duplicated troubleshooting content across pages.

• "Connecting to your database" is now the single entry point: explains the two-string split and why, adds a note on asymmetric failure modes, reorders sections by primary audience, trims troubleshooting to connection-setup problems only.
• "Connection pooling" adds the routing diagram, leads with pooled connection limits, clarifies transactional mode behavior and its consequences, expands "too many connections" with specific root causes.
• "Direct connections" is removed — content absorbed into the connecting page. Redirect to /docs/postgres/database/connecting-to-your-database.

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Build	Status	Details	Updated (UTC)
default (Inspect)	✅ No changes detected	-	Mar 19, 2026, 12:31 PM