Add collaborator page

web-app/src/routes/(authenticated)/website/[websiteId]/publish/+page.svelte

@@ -1,11 +1,14 @@
 <script lang="ts">
   import { enhance } from "$app/forms";
   import WebsiteEditor from "$lib/components/WebsiteEditor.svelte";
+  import SuccessOrError from "$lib/components/SuccessOrError.svelte";
   import type { ActionData, PageServerData } from "./$types";
 
   const { data, form } = $props<{ data: PageServerData; form: ActionData }>();
 </script>
 
+<SuccessOrError success={form?.success} message={form?.message} />
+
 <WebsiteEditor
   id={data.website.id}
   title={data.website.title}