Refactor docs to use Nuxt Content v3 and file-based pages

Migrates documentation from markdown-based content to Nuxt Content v3 with file-based routing. Removes old markdown content files, adds new Vue page components, updates layout and content rendering logic, introduces a Prose wrapper, and updates dependencies for Nuxt Content v3 and related packages.

docs/layouts/default.vue

@@ -0,0 +1,26 @@
+<script setup lang="ts">
+defineProps<{
+  hero?: boolean
+}>()
+
+useHead({
+  bodyAttrs: { class: 'bg-white dark:bg-slate-900' },
+})
+</script>
+
+<template>
+  <div>
+    <ApplicationHeader />
+    <Hero v-if="hero" />
+    <div
+      class="relative mx-auto flex max-w-8xl justify-center sm:px-2 lg:px-8 xl:px-12"
+    >
+      <SidebarNavigation />
+      <div
+        class="min-w-0 max-w-2xl flex-auto px-4 py-16 lg:max-w-none lg:pr-0 lg:pl-8 xl:px-16"
+      >
+        <slot />
+      </div>
+    </div>
+  </div>
+</template>