How can I use jQuery in JS file? (feat.Flask)

app.py

from flask import Flask, render_template, request, jsonify

app = Flask(__name__)

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

if __name__ == '__main__':
    app.run('0.0.0.0', port=5000, debug=True)

index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">

    <link rel="stylesheet" href="static/index.css">

    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>

    <script src="scripts/jquery-1.10.2.js"></script>
    <script src="/jquery/index.js"></script>

    <title>Title</title>
    <script>

    </script>
</head>
<body>
    <h1>Hello World!</h1>
</body>
</html>

index.js

$(function () {
    $(document).ready(function () {
        alert('Hello World');
    });
}

I think I'm doing something wrong. I want to show a message when the document is ready. Even if I run app.py, the alert doesn't appear.

enter image description here