Hide code cells in getting started guide for improved user experience

Enhance and redesign DuckDB introductory notebook

Add DuckDB getting started guide with interactive examples. This commit introduces a new Python script that serves as a comprehensive guide to getting started with DuckDB. It includes interactive examples for database connections, table creation, data insertion, basic queries, and integration with Polars. The guide aims to facilitate learning and experimentation with DuckDB's features in a user-friendly manner.