Add logo image and update branding across header, footer, and emails

- Replace text logo with logo-spanglish.png in Header and Footer
- Update email templates to use logo image instead of styled text
- Add new HeroSection and EventHighlight components
- Update homepage layout and event detail pages
- Adjust Tailwind config and global styles

frontend/src/app/globals.css

@@ -1,5 +1,3 @@
-@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Poppins:wght@500;600;700&display=swap');
-
 @tailwind base;
 @tailwind components;
 @tailwind utilities;