Add guide for CDN, menu reorg

doc/cdn/PluginDoc.vue

@@ -0,0 +1,23 @@
+<template>
+    <DocSectionText v-bind="$attrs">
+        <p>
+            PrimeVue plugin is required to be installed as an application plugin to set up the default <NuxtLink to="/configuration">configuration</NuxtLink>. The plugin is lightweight, only sets up the configuration object without affecting your
+            application.
+        </p>
+    </DocSectionText>
+    <DocSectionCode :code="code" hideToggleCode importCode hideCodeSandbox hideStackBlitz />
+</template>
+
+<script>
+export default {
+    data() {
+        return {
+            code: {
+                basic: `
+app.use(primevue.config.default);
+`
+            }
+        };
+    }
+};
+</script>