Document pg_dump style and fix stale "how it works" intro

[gmr]

• Add pg_dump to the styles table and a dedicated section with a real ruleutils.c deparser example, noting pgdump/postgres aliases
• Add a --style pg_dump usage example piping pg_dump output through pgfmt
• Rewrite the intro: pgfmt is a CLI wrapper around the Rust libpgfmt crate (parsing via tree-sitter-postgres), replacing the stale Python-era description and dead GitHub link

Summary by CodeRabbit

• Documentation
  • Updated README with clearer description of pgfmt as a PostgreSQL SQL formatter
  • Added new pg_dump style option for formatting PostgreSQL dump output
  • Included example usage for round-tripping pg_dump --schema-only output with pgfmt

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 4c5b805 and e152aad.

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• README.md

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📝 Walkthrough

Walkthrough

The README is updated to reframe pgfmt as a wrapper around libpgfmt, add a pg_dump style entry to the styles table, include a usage example for pg_dump --schema-only round-tripping, and add a dedicated ### pg_dump section with formatting rules and a SQL example.

Changes

pg_dump style documentation

Layer / File(s)	Summary
README: pg_dump style entry and reference section README.md	Intro rewritten to describe pgfmt as a libpgfmt wrapper parsing via tree-sitter-postgres; usage example added for pg_dump --schema-only round-tripping; pg_dump row added to the styles table; ### pg_dump section added documenting ruleutils.c deparser mimicry, uppercase keywords, byte-identical round-trip requirement, accepted aliases, and an SQL example.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐇 Hoppy news from the warren today,
pg_dump style has joined the fray!
Round-trip your schemas, byte by byte,
ruleutils.c keeps it right.
One README patch, the docs now gleam — thump thump! 🥕

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