Add deprecation notice

assets/styles/layout/_doc.scss

@@ -145,15 +145,15 @@
             @include doc-link();
         }
     }
+}
 
-    .notification {
+.doc-notification {
     line-height: 1.5;
     padding: 1rem;
     font-weight: 500;
     border-radius: 10px;
     background: var(--mark-background);
     color: var(--mark-text);
-    }
 }
 
 .doc-section-nav {

doc/tabview/ImportDoc.vue

@@ -1,4 +1,5 @@
 <template>
+    <div class="doc-notification">TabView is deprecated, use <NuxtLink to="/tabs" class="doc-link">Tabs</NuxtLink> instead.</div>
     <DocSectionText v-bind="$attrs" />
     <DocSectionCode :code="code" hideToggleCode importCode hideStackBlitz />
 </template>