Rename SQL Queries to Query and add Python API documentation

- Rename sql-queries.qmd to query.qmd
- Add comprehensive Python query API documentation with examples
- Update navigation from 'SQL Queries' to 'Query'
- Update README tagline to list all 7 supported databases instead of 'DuckDB only'

Author: nicosuave

README.md

@@ -1,6 +1,6 @@
 # Sidemantic
 
-SQL-first semantic layer for consistent metrics across your data stack. Import from Cube, dbt MetricFlow, LookML, Hex, Rill, Superset, and Omni. Unapologetically supports DuckDB and DuckDB *only* at the moment.
+SQL-first semantic layer for consistent metrics across your data stack. Import from Cube, dbt MetricFlow, LookML, Hex, Rill, Superset, and Omni. Supports DuckDB, PostgreSQL, BigQuery, Snowflake, ClickHouse, Databricks, and Spark SQL.
 
 [Documentation](https://sidemantic.com) • [GitHub](https://github.com/sidequery/sidemantic)
 

docs/_quarto.yml

@@ -33,8 +33,8 @@ website:
             href: metrics.qmd
           - text: "Relationships"
             href: relationships.qmd
-          - text: "SQL Queries"
-            href: sql-queries.qmd
+          - text: "Query"
+            href: query.qmd
       - text: "CLI"
         menu:
           - text: "Overview"