Update project to use only one port

[SandraRodgers]

A suggestion made by @etiennecallies is to update the project to use only one port. See discussion at: #4

This could be done by implementing the following:

from flask import Flask, render_template, session
from flask_socketio import SocketIO

FLASK_HOST = "127.0.0.1"
FLASK_PORT = "5001"
FLASK_DEBUG = "True"

app = Flask("deep_audio_ai")
socketio = SocketIO(app, cors_allowed_origins=[f"http://{FLASK_HOST}:{FLASK_PORT}"])

@app.route("/")
def index():
    return render_template("index.html")

@socketio.on("connect")
def handle_connect(auth):
    logging.info("Client connecting")
    socketio.start_background_task(target=on_connect)

...

if __name__ == "__main__":
    logging.info("Starting Flask")
    socketio.run(
        app,
        allow_unsafe_werkzeug=True,
        debug=FLASK_DEBUG == "True",
        host=FLASK_HOST,
        port=int(FLASK_PORT),
    )