chore: documentation (#76)

* chore: update docstring example to use python code block

* docs: add documentation

* feat: add docs build + fix other workdlows

* fix: add missing return type

src/fastapi_toolsets/cli/utils.py

@@ -13,11 +13,13 @@ def async_command(func: Callable[P, Coroutine[Any, Any, T]]) -> Callable[P, T]:
     """Decorator to run an async function as a sync CLI command.
 
     Example:
+        ```python
         @fixture_cli.command("load")
         @async_command
         async def load(ctx: typer.Context) -> None:
             async with get_db_context() as session:
                 await load_fixtures(session, registry)
+        ```
     """
 
     @functools.wraps(func)