refactor: move app.py and excluded_containers.json to app/ directory

Dockerfile

@@ -6,7 +6,8 @@ WORKDIR /app
 COPY requirements.txt /app/requirements.txt
 RUN pip install --no-cache-dir -r requirements.txt
 
-COPY app.py /app/app.py
+COPY app/app.py /app/app.py
+COPY app/excluded_containers.json /app/excluded_containers.json
 COPY ./app/templates /app/templates
 COPY ./app/static /app/static