refactor: refine layout directory structure

src/views/layout/components/AppMain.vue

@@ -0,0 +1,18 @@
+<template>
+	<section class="app-main" style="min-height: 100%">
+		<transition name="fade" mode="out-in">
+			<router-view :key="key"></router-view>
+		</transition>
+	</section>
+</template>
+
+<script>
+export default {
+  name: 'AppMain',
+  computed: {
+    key() {
+      return this.$route.name !== undefined ? this.$route.name + +new Date() : this.$route + +new Date()
+    }
+  }
+}
+</script>