docs: the duckdb extension is now easy to install and use (#4862)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

web/book/src/project/integrations/duckdb.md

@@ -1,7 +1,18 @@
 # DuckDB
 
-There's an experimental [DuckDB](https://duckdb.org/) extension from
-**[@ywelsch](https://github.com/ywelsch)** at
-[ywelsch/duckdb-prql](https://github.com/ywelsch/duckdb-prql).
+There's a [DuckDB](https://duckdb.org/) community extension by
+**[@ywelsch](https://github.com/ywelsch)** at the DuckDB Community Extension
+Repository.
 
-Check out the Readme for more details.
+```sql
+INSTALL prql FROM community;
+LOAD prql;
+-- Once the extension is loaded, you can write PRQL queries
+from (read_csv 'https://raw.githubusercontent.com/PRQL/prql/0.8.0/prql-compiler/tests/integration/data/chinook/invoices.csv')
+filter invoice_date >= @2009-02-01
+take 5;
+```
+
+Check out the
+[extension's documentation](https://community-extensions.duckdb.org/extensions/prql.html)
+for more details.