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/crud.md

@@ -0,0 +1,20 @@
+# `crud`
+
+Here's the reference for the CRUD classes, factory, and search utilities.
+
+You can import the main symbols from `fastapi_toolsets.crud`:
+
+```python
+from fastapi_toolsets.crud import CrudFactory, AsyncCrud
+from fastapi_toolsets.crud.search import SearchConfig, get_searchable_fields, build_search_filters
+```
+
+## ::: fastapi_toolsets.crud.factory.AsyncCrud
+
+## ::: fastapi_toolsets.crud.factory.CrudFactory
+
+## ::: fastapi_toolsets.crud.search.SearchConfig
+
+## ::: fastapi_toolsets.crud.search.get_searchable_fields
+
+## ::: fastapi_toolsets.crud.search.build_search_filters