feat: Add favicon and SEO (JSON-LD schema, meta tags)

- Add favicon image
- Add JSON-LD schema for Hackathon event
- Add react-helmet-async for managing meta tags

libs/utils/src/index.ts

@@ -7,3 +7,4 @@ export * from './cookies';
 export * from './session';
 export * from './constants';
 export * from './logic';
+export * from './seo';

libs/utils/src/seo/index.ts

@@ -0,0 +1 @@
+export { Helmet, HelmetProvider } from 'react-helmet-async';