feature: [sidebar] add external-link (#991)

src/views/layout/components/Sidebar/Item.vue

@@ -0,0 +1,29 @@
+<script>
+export default {
+  name: 'MenuItem',
+  functional: true,
+  props: {
+    icon: {
+      type: String,
+      default: ''
+    },
+    title: {
+      type: String,
+      default: ''
+    }
+  },
+  render(h, context) {
+    const { icon, title } = context.props
+    const vnodes = []
+
+    if (icon) {
+      vnodes.push(<svg-icon icon-class={icon}/>)
+    }
+
+    if (title) {
+      vnodes.push(<span slot='title'>{(title)}</span>)
+    }
+    return vnodes
+  }
+}
+</script>