Fix #5842 and refactoring

src/client/pages/announcements.vue

@@ -4,7 +4,7 @@
 	<portal to="title">{{ $t('announcements') }}</portal>
 
 	<mk-pagination :pagination="pagination" #default="{items}" class="ruryvtyk" ref="list">
-		<section class="_card announcement" v-for="(announcement, i) in items" :key="announcement.id" :data-index="i">
+		<section class="_card announcement" v-for="(announcement, i) in items" :key="announcement.id">
 			<div class="_title"><span v-if="$store.getters.isSignedIn && !announcement.isRead">🆕 </span>{{ announcement.title }}</div>
 			<div class="_content">
 				<mfm :text="announcement.text"/>