Add docs

docs/src/.vuepress/theme/components/Sidebar.vue

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+<template>
+  <aside class="sidebar">
+    <NavLinks />
+
+    <slot name="top" />
+
+    <SidebarLinks
+      :depth="0"
+      :items="items"
+    />
+    <slot name="bottom" />
+  </aside>
+</template>
+
+<script>
+import SidebarLinks from '@theme/components/SidebarLinks.vue'
+import NavLinks from '@theme/components/NavLinks.vue'
+
+export default {
+  name: 'Sidebar',
+
+  components: { SidebarLinks, NavLinks },
+
+  props: ['items']
+}
+</script>
+
+<style lang="stylus">
+.sidebar
+  ul
+    padding 0
+    margin 0
+    list-style-type none
+  a
+    display inline-block
+  .nav-links
+    display none
+    border-bottom 1px solid $borderColor
+    padding 0.5rem 0 0.75rem 0
+    a
+      font-weight 600
+    .nav-item, .repo-link
+      display block
+      line-height 1.25rem
+      font-size 1.1em
+      padding 0.5rem 0 0.5rem 1.5rem
+  & > .sidebar-links
+    padding 1.5rem 0
+    & > li > a.sidebar-link
+      font-size 1.1em
+      line-height 1.7
+      font-weight bold
+    & > li:not(:first-child)
+      margin-top .75rem
+
+@media (max-width: $MQMobile)
+  .sidebar
+    .nav-links
+      display block
+      .dropdown-wrapper .nav-dropdown .dropdown-item a.router-link-active::after
+        top calc(1rem - 2px)
+    & > .sidebar-links
+      padding 1rem 0
+</style>