Add screenshot and update README

- Added a new screenshot image.
- Removed Alpine.js reference from the README.
- Updated README to include Gsap instead of Alpine.js.

Author: zanhk

.github/images/screenshot.png

@@ -2,9 +2,8 @@
 
 <a href="https://astro.build/">![Astro](.github/images/astro-icon.png)</a>
 <a href="https://tailwindcss.com/">![Tailwind](.github/images/tailwind-icon.png)</a>
-<a href="https://alpinejs.dev/">![Alpine js](.github/images/alpine-icon.png)</a>
 
-Mintaka is a template made with [Astro](https://astro.build), [Tailwind](https://tailwindcss.com/) and [AlpineJS](https://alpinejs.dev/).
+Mintaka is a template made with [Astro](https://astro.build), [Tailwind](https://tailwindcss.com/) and [Gsap](https://gsap.com/)
 
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