refactor: replace SVG icons with Iconify components in Header and OpenSource sections

- Updated Header.astro to use Iconify for external link, donate, and menu icons.
- Replaced SVG icons with Iconify components for consistency and improved maintainability.
- Updated OpenSource.astro to use Iconify for the open-source badge and social media links.
- Added new dependencies for Iconify JSON packages in package.json.

Author: Prot10

website/astro.config.mjs

@@ -1,13 +1,15 @@
 import { defineConfig } from 'astro/config';
 import tailwind from '@astrojs/tailwind';
 import sitemap from '@astrojs/sitemap';
+import icon from 'astro-icon';
 
 export default defineConfig({
   site: 'https://Prot10.github.io',
   base: '/MyMacCleaner',
   integrations: [
     tailwind(),
-    sitemap()
+    sitemap(),
+    icon()
   ],
   output: 'static',
   build: {