Streamline Postgres best practices

[tembo]

Summary

Condensed the Postgres integration best practices section by:

• Simplified bullet points with em dashes for better readability
• Reduced verbose explanations while preserving key information
• Removed redundant "Monitor Production Databases" and "Test in Staging" points
• Streamlined pg_stat_statements setup instructions, removing detailed troubleshooting steps
• Cut word count by ~40% without losing essential guidance

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