[UPD] move kit.prerender.default to layout

Setting was deprecated. See error:

Error: config.kit.prerender.default has been removed. You can set it inside the top level +layout.js instead. See the PR for more information: sveltejs/kit#6197

src/routes/+layout.svelte

@@ -1,4 +1,6 @@
 <script>
+    export const prerender = true;
+
     import '../styles';
     import SiteHeader from '$lib/components/SiteHeader.svelte';
     import SiteFooter from '$lib/components/SiteFooter.svelte';

svelte.config.js

@@ -12,7 +12,6 @@ const config = {
             lib: './src/lib',
         },
         prerender: {
-            default: true,
             entries: [
                 ...articleSlugs.map(slug => `/blog/${slug}`),
                 ...articleSlugs.map(slug => `/blog/${slug}.raw`),

vite.config.js

@@ -1,7 +1,7 @@
 import { sveltekit } from '@sveltejs/kit/vite';
 
 const config = {
-	plugins: [sveltekit()]
+    plugins: [sveltekit()]
 };
 
 export default config;