feat: Cloudinary image migration & preloader removal

- Migrated 25 images to Cloudinary CDN with auto format/quality optimization
- Removed preloader from all pages
- Added .gitignore for env, node_modules, and large image files

images/icon-mail.svg

@@ -0,0 +1,6 @@
+<svg width="20" height="21" viewBox="0 0 20 21" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M19.8234 4.7207L13.7578 10.7472L19.8234 16.7737C19.933 16.5446 19.9996 16.2912 19.9996 16.0207V5.47379C19.9996 5.2032 19.933 4.94988 19.8234 4.7207Z" fill="#100F11"/>
+<path d="M18.2423 3.71582H1.75797C1.48738 3.71582 1.23406 3.78234 1.00488 3.89199L8.75735 11.6054C9.44281 12.2909 10.5575 12.2909 11.243 11.6054L18.9954 3.89199C18.7663 3.78234 18.5129 3.71582 18.2423 3.71582Z" fill="#100F11"/>
+<path d="M0.176172 4.7207C0.0665234 4.94988 0 5.2032 0 5.47379V16.0207C0 16.2912 0.0665234 16.5446 0.176172 16.7737L6.24176 10.7472L0.176172 4.7207Z" fill="#100F11"/>
+<path d="M12.9298 11.5752L12.0715 12.4335C10.9294 13.5757 9.0709 13.5757 7.92875 12.4335L7.07047 11.5752L1.00488 17.6017C1.23406 17.7114 1.48738 17.7779 1.75797 17.7779H18.2423C18.5129 17.7779 18.7663 17.7114 18.9954 17.6017L12.9298 11.5752Z" fill="#100F11"/>
+</svg>