add analytics (#714)

add analytics - closes #706

Author: Rich-Harris

apps/svelte.dev/package.json

@@ -28,6 +28,7 @@
 		"@testing-library/svelte": "^5.2.3",
 		"@testing-library/user-event": "^14.5.2",
 		"@types/d3-geo": "^3.1.0",
+		"@vercel/analytics": "^1.3.2",
 		"@vercel/speed-insights": "^1.0.0",
 		"@webcontainer/api": "^1.1.5",
 		"adm-zip": "^0.5.10",

apps/svelte.dev/src/routes/+layout.svelte

@@ -1,14 +1,16 @@
 <script lang="ts">
 	import '@sveltejs/site-kit/styles/index.css';
-	import { browser } from '$app/environment';
+	import { browser, dev } from '$app/environment';
 	import { page } from '$app/stores';
 	import { Shell, Banner } from '@sveltejs/site-kit/components';
 	import { Nav } from '@sveltejs/site-kit/nav';
 	import { SearchBox } from '@sveltejs/site-kit/search';
 	import { injectSpeedInsights } from '@vercel/speed-insights/sveltekit';
+	import { inject } from '@vercel/analytics';
 	import { beforeNavigate } from '$app/navigation';
 
 	injectSpeedInsights();
+	inject({ mode: dev ? 'development' : 'production' });
 
 	// Make all navigations between SvelteKit-tutorial and non-SvelteKit-tutorial pages (and vice versa)
 	// a full page navigation to ensure webcontainers get the correct origin restriction headers while