add page navigation

docs/src/components/PageNavigation/index.vue

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+<template>
+  <nav class="page-navigation">
+    <div class="page-navigation__previous">
+      <g-link
+        class="page-navigation__link"
+        exact
+        :to="previousPage.link"
+        v-if="previousPage"
+      >
+        &larr; {{ previousPage.title }}
+      </g-link>
+    </div>
+    <div class="page-navigation__next">
+      <g-link
+        class="page-navigation__link"
+        exact
+        :to="nextPage.link"
+        v-if="nextPage"
+      >
+        {{ nextPage.title }} &rarr;
+      </g-link>
+    </div>
+  </nav>
+</template>
+
+<script>
+import linkGroups from '@/data/links.yaml'
+
+export default {
+  data() {
+    return {
+      linkGroups,
+    }
+  },
+
+  computed: {
+    items() {
+      return this.linkGroups.reduce((acc, group) => (acc.push(...group.items), acc), [])
+    },
+
+    currentIndex() {
+      return this.items.findIndex(item => {
+        return item.link.replace(/\/$/, '') === this.$route.path.replace(/\/$/, '')
+      })
+    },
+
+    nextPage() {
+      return this.items[this.currentIndex + 1]
+    },
+
+    previousPage() {
+      return this.items[this.currentIndex - 1]
+    },
+  }
+}
+</script>
+
+<style lang="scss" src="./style.scss" scoped></style>

docs/src/components/PageNavigation/style.scss

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+.page-navigation {
+  display: flex;
+  justify-content: space-between;
+  padding: 3rem 0;
+}