docs(deps): update @nuxt/content and move content/ outside of app/

docs/content/1.getting-started/5.dark-mode.md

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+---
+title: 'Dark mode'
+description: ''
+---
+
+All the components are styled with dark mode in mind.
+
+Thanks to [Tailwind CSS dark mode](https://tailwindcss.com/docs/dark-mode#toggling-dark-mode-manually) class strategy and the [@nuxtjs/color-mode](https://github.com/nuxt-modules/color-mode) module, you literally have nothing to do.
+
+You can disable dark mode by setting the `preference` to `light` instead of `system` in your `nuxt.config.ts`.
+
+```ts [nuxt.config.ts]
+export default defineNuxtConfig({
+  colorMode: {
+    preference: 'light'
+  }
+})
+```
+
+::callout{icon="i-heroicons-light-bulb"}
+If you're stuck in dark mode even after changing this setting, you might need to remove the `nuxt-color-mode` entry from your browser's local storage.
+::
+
+You can easily build a color mode button by using the `useColorMode` composable from `@nuxtjs/color-mode`.
+
+::component-example
+#default
+:color-mode-button
+
+#code
+```vue
+<script setup lang="ts">
+const colorMode = useColorMode()
+const isDark = computed({
+  get () {
+    return colorMode.value === 'dark'
+  },
+  set () {
+    colorMode.preference = colorMode.value === 'dark' ? 'light' : 'dark'
+  }
+})
+</script>
+<template>
+  <ClientOnly>
+    <UButton
+      :icon="isDark ? 'i-heroicons-moon-20-solid' : 'i-heroicons-sun-20-solid'"
+      color="gray"
+      variant="ghost"
+      aria-label="Theme"
+      @click="isDark = !isDark"
+    />
+    <template #fallback>
+      <div class="w-8 h-8" />
+    </template>
+  </ClientOnly>
+</template>
+```
+::