feat: support layouts (#56)

Co-authored-by: Anthony Fu <anthonyfu117@hotmail.com>

src/layouts/404.vue

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+<script setup lang="ts">
+import { useRouter } from 'vue-router'
+import { useI18n } from 'vue-i18n'
+
+const router = useRouter()
+const { t } = useI18n()
+</script>
+
+<template>
+  <main class="px-4 py-10 text-center text-teal-700 dark:text-gray-200">
+    <div>
+      <p class="text-4xl">
+        <carbon-warning class="inline-block" />
+      </p>
+    </div>
+    <router-view />
+    <div>
+      <button
+        class="btn m-3 text-sm mt-8"
+        @click="router.back()"
+      >
+        {{ t('button.back') }}
+      </button>
+    </div>
+  </main>
+</template>

src/layouts/README.md

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+## Layouts
+
+Vue components in this dir are used as layouts.
+
+By default, `default.vue` will be used unless an alternative is specified in the route meta.
+
+With [`vite-plugin-pages`](https://github.com/hannoeru/vite-plugin-pages) and [`vite-plugin-vue-layouts`](https://github.com/JohnCampionJr/vite-plugin-vue-layouts), you can specify the layout in the page's SFCs like this:
+
+```html
+<route lang="yaml">
+meta:
+  layout: home
+</route>
+```

src/layouts/default.vue

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+<template>
+  <main class="px-4 py-10 text-center text-teal-700 dark:text-gray-200">
+    <router-view />
+    <Footer />
+    <div class="mt-5 m-auto text-center opacity-25 text-sm">
+      [Default Layout]
+    </div>
+  </main>
+</template>

src/layouts/home.vue

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+<template>
+  <main class="px-4 py-10 text-center text-teal-700 dark:text-gray-200">
+    <router-view />
+    <Footer />
+    <div class="mt-5 m-auto text-center opacity-25 text-sm">
+      [Home Layout]
+    </div>
+  </main>
+</template>