Use YAML file to allow user to configure application. Add tests

- YAML Config
  - Can specify all params[1] earlier being passed via cmd args in config YAML
  - Can now also configure sentence-transformer models to use etc for search
    - [1] Config params
       - org files
       - compressed entries file config path
       - embeddings file config path

  - Include sample_config.yaml
  - Include sample .org file from this repos readmes

- CLI
  - Configuration Priority: Config via cmd > Config via YAML > Default Config
  - Test CLI, include test config.yml for the tests

- Set default type to None unless set via query param to API
  Run notes search if search_enabled, also if type is None (default)
  Prepares for running queries on all search types unless type
  specified in API query param

- Update Readme

environment.yml

@@ -9,4 +9,5 @@ dependencies:
   - sentence-transformers
   - fastapi
   - uvicorn
+  - pyyaml
   - pytest