Renamed backend folder

Dockerfile

@@ -6,9 +6,9 @@ COPY front .
 RUN npm run build
 
 FROM python:3-slim
-WORKDIR /app
+WORKDIR /srv
 COPY requirements.txt .
 RUN pip install --no-cache-dir --upgrade -r requirements.txt
-COPY ./app ./app
+COPY ./back ./back
 COPY --from=builder /src/dist ./front/dist
-CMD uvicorn app.main:app --host 0.0.0.0 --port 80
+CMD uvicorn back.main:app --host 0.0.0.0 --port 80