Update scripts.js

[Imran-imtiaz48]

Improvements Made:

1. Event Binding: o Changed $("#subscribe").click(function (event) { to $("#subscribe").on("click", function (event) { for consistency and better practice.
2. Variable Naming: o Renamed subscribedemail to subscribedEmail to follow camelCase naming convention.
3. Trim Input: o Added .trim() to $("#emailaddress").val() to remove any leading or trailing whitespace.
4. Validation: o Added a check to ensure the email field is not empty before showing the alert and clearing the field.
5. Clear Input Field: o Added a comment for clarity on why the input field is being cleared