Add about page and configuration for SvelteKit

examples/svelte/src/routes/about/+page.svelte

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+<svelte:head>
+	<title>About</title>
+	<meta name="description" content="About this app" />
+</svelte:head>
+
+<div class="text-column">
+	<h1>About this app</h1>
+
+	<p>
+		This is a <a href="https://kit.svelte.dev">SvelteKit</a> app. You can make your own by typing the
+		following into your command line and following the prompts:
+	</p>
+
+	<pre>npm create svelte@latest</pre>
+
+	<p>
+		The page you're looking at is purely static HTML, with no client-side interactivity needed.
+		Because of that, we don't need to load any JavaScript. Try viewing the page's source, or opening
+		the devtools network panel and reloading.
+	</p>
+
+	<p>
+		The <a href="/sverdle">Sverdle</a> page illustrates SvelteKit's data loading and form handling. Try
+		using it with JavaScript disabled!
+	</p>
+</div>

examples/svelte/src/routes/about/+page.ts

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+import { dev } from '$app/environment';
+
+// we don't need any JS on this page, though we'll load
+// it in dev so that we get hot module replacement
+export const csr = dev;
+
+// since there's no dynamic data here, we can prerender
+// it so that it gets served as a static asset in production
+export const prerender = true;