refactor: new project structure

src/components/index.js

@@ -0,0 +1,17 @@
+import Aside from './Aside.vue'
+import Breadcrumb from './Breadcrumb.vue'
+import Callout from './Callout.vue'
+import Footer from './Footer.vue'
+import Header from './Header/Header.vue'
+import Sidebar from './Sidebar/Sidebar.vue'
+import Switch from './Switch.vue'
+
+export {
+  Aside,
+  Breadcrumb,
+  Callout,
+  Footer,
+  Header,
+  Sidebar,
+  Switch
+}