Merge relevant Abstract and references

• merge the 2 sections
• Make the way references are displayed more compact

components/content/ArticleDoi.vue

@@ -34,10 +34,10 @@ const articleAbstract = computed(() => {
 <template>
   <v-list-item :href="article?.href" :id="props.doi" :target="article?.target" density="compact" color="transparent"
     class="px-1">
-    <template #prepend>
+    <template v-if="!mobile" #prepend>
       <v-icon icon="md:star" :color="props.isRelevant ? 'info' : 'transparent'"></v-icon>
     </template>
-    <template #append>
+    <template v-if="!mobile" #append>
       <v-btn v-if="articleAbstract" size="x-small" variant="plain"
         :append-icon="show ? 'mdi-chevron-up' : 'mdi-chevron-down'" class="px-0"
         @click.stop.prevent="show = !show">Abstract</v-btn>