Add DuckDB to webpage dropdown

Author: LukeLambert

static/index.html

@@ -61,6 +61,7 @@ <h3 style="margin: 0.5rem 0">Options</h3>
               <option value="bigquery">BigQuery</option>
               <option value="db2">DB2</option>
               <option value="db2i">DB2 for IBM i</option>
+              <option value="duckdb">DuckDB</option>
               <option value="hive">Hive</option>
               <option value="mariadb">MariaDB</option>
               <option value="mysql">MySQL</option>