open external links in new tab

astro.config.mjs

@@ -4,6 +4,7 @@ import alpinejs from '@astrojs/alpinejs';
 import mdx from '@astrojs/mdx';
 import { defineConfig } from 'astro/config';
 import pagefind from 'astro-pagefind';
+import rehypeExternalLinks from 'rehype-external-links';
 
 // https://astro.build/config
 export default defineConfig({
@@ -16,6 +17,9 @@ export default defineConfig({
 				dark: 'github-dark',
 			},
 		},
+		rehypePlugins: [
+			[rehypeExternalLinks, { target: '_blank', rel: ['noopener', 'noreferrer'] }],
+		],
 	},
 	integrations: [
 		mdx(),