feat: add the not found page (#368)

src/views/NotFound.vue

@@ -0,0 +1,33 @@
+<!-- Licensed to the Apache Software Foundation (ASF) under one or more
+contributor license agreements.  See the NOTICE file distributed with
+this work for additional information regarding copyright ownership.
+The ASF licenses this file to You under the Apache License, Version 2.0
+(the "License"); you may not use this file except in compliance with
+the License.  You may obtain a copy of the License at
+
+  http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License. -->
+<template>
+  <div class="not-found flex-h">
+    <Icon size="largest" iconName="logo-light" />
+    <h1 class="ml-20">404 Page Not Found</h1>
+  </div>
+</template>
+<style lang="scss" scoped>
+  .not-found {
+    height: 100%;
+    width: 100%;
+    align-items: center;
+    justify-content: center;
+  }
+
+  .icon {
+    width: 160px;
+    height: 160px;
+  }
+</style>