use instance slogan in Home for non-logged-in users instead of description

js/src/components/Home/UnloggedIntroduction.vue

@@ -1,6 +1,6 @@
 <template>
   <section class="container mx-auto px-2 my-3">
-    <p class="dark:text-white mb-2">{{ config.description }}</p>
+    <p class="dark:text-white mb-2">{{ config.slogan }}</p>
     <!-- We don't invite to find other instances yet -->
     <!-- <p v-if="!config.registrationsOpen">
               {{ t("This instance isn't opened to registrations, but you can register on other instances.") }}