MegaMenu, Menu, Menubar unstyled demo updates

doc/menu/theming/UnstyledDoc.vue

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+<template>
+    <DocSectionText v-bind="$attrs">
+        <p>Theming is implemented with the pass through properties in unstyled mode. Example below demonstrates the built-in Tailwind theme.</p>
+    </DocSectionText>
+    <DocSectionCode :code="code" embedded />
+</template>
+
+<script>
+export default {
+    data() {
+        return {
+            items: [
+                { label: 'New', icon: 'pi pi-fw pi-plus' },
+                { label: 'Delete', icon: 'pi pi-fw pi-trash' }
+            ],
+            code: {
+                composition: `
+<template>
+    <div class="card flex justify-center">
+        <Menu :model="items" />
+    </div>
+</template>
+
+<script setup>
+import { ref } from "vue";
+
+const items = ref([
+    { label: 'New', icon: 'pi pi-fw pi-plus' },
+    { label: 'Delete', icon: 'pi pi-fw pi-trash' }
+]);
+<\/script>`
+            }
+        };
+    }
+};
+</script>

doc/menu/theming/index.vue

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+<template>
+    <div class="doc-main">
+        <div class="doc-intro">
+            <h1>Menu Theming</h1>
+        </div>
+        <DocSections :docs="docs" />
+    </div>
+    <DocSectionNav :docs="docs" />
+</template>
+
+<script>
+import StyledDoc from './StyledDoc.vue';
+import UnstyledDoc from './UnstyledDoc.vue';
+
+export default {
+    data() {
+        return {
+            docs: [
+                {
+                    id: 'styled',
+                    label: 'Styled',
+                    component: StyledDoc
+                },
+                {
+                    id: 'unstyled',
+                    label: 'Unstyled',
+                    component: UnstyledDoc
+                }
+            ]
+        };
+    }
+};
+</script>