feat: setup posthog for metrics (might or might not be useful)

src/routes/+layout.svelte

@@ -1,7 +1,16 @@
 <script lang="ts">
+    import posthog from "posthog-js";
     import logoUrl from "$lib/assets/logo.svg";
+    import { onMount } from "svelte";
 
     const { children } = $props();
+
+    onMount(() => {
+        posthog.init("phc_hTnel2Q8GKo0TgIBnFWBueJW1ATmCG9tJOtETnQTUdY", {
+            api_host: "https://eu.i.posthog.com",
+            person_profiles: "always"
+        });
+    });
 </script>
 
 <svelte:head>