CHANGE: Code Refactoring + Docker image + small fixes

Dockerfile

@@ -1,9 +1,9 @@
-FROM python:3.9
+FROM python:3.12.2-alpine
 COPY requirements.txt /home
 RUN pip install -r /home/requirements.txt
 COPY src webserver
 WORKDIR /webserver
 
 ENV FLASK_DEGUB=false
-ENTRYPOINT [ "python3", "-u", "main.py" ]
-EXPOSE 5000
+ENTRYPOINT [ "python3", "-u", "app.py" ]
+EXPOSE 5000