v2.9.0

• Add SQLite and SQLiteDatabaseClient to the standard library #204
• Add FileAttachment.sqlite for creating a SQLitedDatabaseClient from a SQLite file
• Add FileAttachment.duckdb for creating a DuckDBClient from a DuckDB file
• Add support for file: databases to SQL cells for SQLite and DuckDB files
• Fix the definition of ReactDOM in the standard library
• Implement notebooks version #207 Thanks, @RaphaelFakhri.