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

docs/reference/pytest.md

@@ -0,0 +1,28 @@
+# `pytest`
+
+Here's the reference for all testing utilities and pytest fixtures.
+
+You can import them directly from `fastapi_toolsets.pytest`:
+
+```python
+from fastapi_toolsets.pytest import (
+    register_fixtures,
+    create_async_client,
+    create_db_session,
+    worker_database_url,
+    create_worker_database,
+    cleanup_tables,
+)
+```
+
+## ::: fastapi_toolsets.pytest.plugin.register_fixtures
+
+## ::: fastapi_toolsets.pytest.utils.create_async_client
+
+## ::: fastapi_toolsets.pytest.utils.create_db_session
+
+## ::: fastapi_toolsets.pytest.utils.worker_database_url
+
+## ::: fastapi_toolsets.pytest.utils.create_worker_database
+
+## ::: fastapi_toolsets.pytest.utils.cleanup_tables