fix: move pages animation to onMount

apps/website/src/routes/(site)/subscribe/+page.svelte

@@ -2,6 +2,7 @@
 
 <script lang="ts">
     import { navigating } from '$app/stores'
+    import { onMount } from 'svelte'
     import { stagger, timeline } from 'motion'
     import { DELAY } from '$utils/constants'
     import { quartOut } from '$animations/easings'
@@ -17,7 +18,7 @@
     const latestIssue = $derived(data.issues[0])
 
 
-    $effect(() => {
+    onMount(() => {
         /**
          * Animations
          */