refac: removed example lazy-load comp | feat: lazy-loading list and single comp

vue-theme/src/components/navigation/navigation.vue

             a(href="/artists") artists
         li
             a(href="/episodes") episodes
-        li
-            a(href="/lazy") lazy
 </template>

vue-theme/src/index.js

 import store from '@/store'
 
 import IndexPage from '@/pages/index.vue'
-import ListPage from '@/pages/list'
-import SinglePage from '@/pages/single'
 
 const router = new VueRouter({
     mode: 'history',
     routes: [
         { path: '/', component: IndexPage },
-        { path: '/lazy', component:  () => import(/* webpackChunkName: "pages-lazy" */ './pages/lazy.vue') },
-        {
-            path: '/:type',
-            component: ListPage,
-            props: { sidebar: true }
-        },
-        {
-            path: '/:type/:id',
-            component: SinglePage,
-            props: { sidebar: true }
-        },
+        { path: '/:type', component: () => import(/* webpackChunkName: "pages-list" */ './pages/list.vue'), props: { sidebar: true } },
+        { path: '/:type/:id', component: () => import(/* webpackChunkName: "pages-single" */ './pages/single.vue'), props: { sidebar: true } },
     ]
 })
 

vue-theme/src/pages/lazy.vue

-<template lang="pug">
-article.page--lazy
-    h1 LAAZYY
-</template>