feat: add header component

- add font Adwaita Sans
- add font styles
- add app styles
- add data json

src/routes/+layout.svelte

@@ -2,12 +2,17 @@
 	import '$lib/styles/app.css';
 	import '$lib/styles/font.css';
 	import favicon from '$lib/assets/favicon.svg';
+	import Header from '$lib/components/Header.svelte';
+	import content from '$lib/data/data.json';
+	import type { Data } from '$lib/types/data';
 
 	let { children } = $props();
+	let data: Data = content;
 </script>
 
 <svelte:head>
 	<link rel="icon" href={favicon} />
 </svelte:head>
 
+<Header {...data.header} />
 {@render children()}