feat(blog): Add Intl support for publish date

demo/src/lib/layout/Published.svelte

@@ -0,0 +1,7 @@
+<script>
+	export let date;
+
+	date = Intl.DateTimeFormat('en-US', {dateStyle: 'full'}).format(new Date(date));
+</script>
+
+<strong class="d-flex mb-2">Published on {date}</strong>

demo/src/routes/blog/+layout.server.ts

@@ -3,7 +3,7 @@ export const load = async () => {
 		menu: [
 			{
 				title: 'News 2024',
-				submenu: [{label: '02-01-2024 State management with Tansu', path: 'blog/2024-02-01', subpath: ''}],
+				submenu: [{label: 'State management with Tansu', path: 'blog/2024-02-01', subpath: ''}],
 			},
 		],
 	};

demo/src/routes/blog/2024-02-01/+page.svelte

@@ -1,6 +1,10 @@
 <script lang="ts">
+	import Header from '$lib/layout/Header.svelte';
+	import Published from '$lib/layout/Published.svelte';
 	import Markdown from '$lib/markdown/Markdown.svelte';
 	import source from './tansu-reactivity.md?raw';
 </script>
 
+<Header title="State management with Tansu" />
+<Published date="02/01/2024" />
 <Markdown {source} />

demo/src/routes/blog/2024-02-01/tansu-reactivity.md

@@ -1,7 +1,3 @@
-# State management with Tansu
-
-**Published on 02/01/2024.**
-
 In [AgnosUI](https://amadeusitgroup.github.io/AgnosUI/latest/), we employ [Tansu](https://github.com/AmadeusITGroup/tansu) to handle our widget states.
 
 This article explores the effective ways to use Tansu for broader state management, drawing upon our practical experience in developing AgnosUI. To follow along, we assume that you have a basic understanding of Tansu's API, as explained in the [README](https://github.com/AmadeusITGroup/tansu/blob/master/README.md) (no need to know them in detail). Feel free to refer to it for reference if needed.