Dockerised. Restructured to remove circular import

Moved most of app definitions out of guard function to use wsgi
Updated configuration files and referencing of .env values.
Local version needs dotenv or exporting of env variables.
Dockerised version works fine without load_dotenv.
Ready to test now!

ref-test/Dockerfile

@@ -2,4 +2,4 @@ FROM python:3.10-slim
 WORKDIR /ref-test
 COPY . .
 RUN pip install --upgrade pip && pip install -r requirements.txt
-CMD [ "gunicorn", "-b", "0.0.0.0:5000", "-w", "8",  "main:app" ]
+CMD [ "gunicorn", "-b", "0.0.0.0:5000", "-w", "5", "wsgi:app" ]