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/components/content/Lead.vue

@@ -1,3 +1,3 @@
 <template>
-  <p class="lead"><ContentSlot :use="$slots.default" unwrap="p" /></p>
+  <p class="lead"><slot mdc-unwrap="p" /></p>
 </template>

docs/components/content/QuickLink.vue

@@ -24,7 +24,7 @@ defineProps<{
         </NuxtLink>
       </h2>
       <p class="mt-1 text-sm text-slate-700 dark:text-slate-400">
-        <ContentSlot :use="$slots.default" unwrap="p" />
+        <slot mdc-unwrap="p" />
       </p>
     </div>
   </div>