Fix analytics breaking on SSR

packages/website/src/hooks.client.ts

@@ -1 +0,0 @@
-import "$lib/analytics"

packages/website/src/lib/analytics.ts

@@ -1,7 +1,13 @@
-(<any>window).dataLayer = (<any>window).dataLayer || [];
+const is_browser = typeof window !== "undefined";
+
+if (is_browser) {
+    (<any>window).dataLayer = (<any>window).dataLayer || [];
+}
 
 export function gtag(...args: any[]) {
+    if (is_browser) {
         (<any>window).dataLayer.push(arguments);
+    }
 }
 
 gtag('js', new Date());

packages/website/src/routes/+layout.svelte

@@ -1,4 +1,5 @@
 <script lang="ts">
+    import "$lib/analytics"
     import "$lib/styles.css";
     import Favicons from "$lib/Favicons.svelte";
     import Nav from "$lib/Nav.svelte";