perf: 菜单改版，account数据列表布局改版；css变量提取等；

nezha-fronted/src/components/layout/container.vue

@@ -0,0 +1,24 @@
+<template>
+  <div class="container">
+    <router-view/>
+  </div>
+</template>
+
+<script>
+export default {
+  name: 'container',
+  data () {
+    return {
+    }
+  }
+}
+</script>
+
+<style scoped>
+.container {
+  padding: 10px;
+  box-sizing: border-box;
+  height: calc(100% - 50px);
+  background-color: #f6f6f6;
+}
+</style>