add heading slugs

svelte.config.js

@@ -1,10 +1,14 @@
 import { mdsvex } from 'mdsvex';
 import staticAdapter from '@sveltejs/adapter-static';
+import slug from './src/lib/slug.js';
 
 
 const config = {
 	extensions: ['.svelte', '.svx'],
-	preprocess: mdsvex({layout: './src/lib/Post.svelte'}),
+	preprocess: mdsvex({
+		layout: './src/lib/Post.svelte',
+		rehypePlugins: [slug],
+	}),
 	kit: {
 		// hydrate the <div id="svelte"> element in src/app.html
 		target: '#svelte',