Add test UI toggle and docs

README.md

@@ -4,7 +4,7 @@ FastAPI microservice that finds the primary subject in an image, draws a square
 
 ## UI
 
-The Tailwind UI is always available at `/`.
+The Tailwind test UI is available at `/` unless disabled with `FACE_LOCK_TEST_UI=false`.
 
 ## Auth
 
@@ -40,6 +40,8 @@ pip install -r requirements.txt
 uvicorn app.main:app --reload --host 0.0.0.0 --port 8000
 ```
 
+Set `FACE_LOCK_TEST_UI=false` to disable the UI.
+
 ## Docker
 
 ```bash