Remove jQuery dependency

[1rgs]

Removes the jQuery dependency from the project and replaces it with vanilla JavaScript for DOM manipulation and event handling.

• Refactors js/script.js:

  • Replaces jQuery's $(document).ready() with vanilla JavaScript's document.addEventListener('DOMContentLoaded', ...).
  • Updates event handlers (click, success) to use document.querySelector and addEventListener instead of jQuery methods.
  • Modifies DOM manipulation to use document.querySelector and classList for adding/removing classes, and innerHTML for content changes.
  • Adjusts style changes from jQuery's .css() method to direct manipulation of the style property on elements.

• Updates index.html:

  • Removes the <script> tag that included jquery-2.2.3.min.js, effectively eliminating the jQuery dependency from the project.

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