docs(VerticalNavigation): add slots examples (#456)

Co-authored-by: Benjamin Canac <canacb1@gmail.com>

docs/components/content/examples/VerticalNavigationExampleAvatarSlot.vue

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+<script setup>
+const links = [{
+  avatar: {
+    src: 'https://avatars.githubusercontent.com/u/739984?v=4'
+  },
+  label: 'Benjamin Canac'
+}, {
+  label: 'KeJun'
+}]
+
+const { ui } = useAppConfig()
+</script>
+
+<template>
+  <UVerticalNavigation :links="links">
+    <template #avatar="{ link }">
+      <UAvatar
+        v-if="link.avatar"
+        v-bind="{ size: ui.verticalNavigation.avatar.size, ...link.avatar }"
+        :class="[ui.verticalNavigation.avatar.base]"
+      />
+      <UIcon v-else name="i-heroicons-user-circle-20-solid" class="text-lg" />
+    </template>
+  </UVerticalNavigation>
+</template>

docs/components/content/examples/VerticalNavigationExampleBadgeSlot.vue

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+<script setup>
+const links = [{
+  label: '.github',
+  icon: 'i-heroicons-folder-20-solid',
+  badge: 'chore(github): use pnpm 8',
+  time: 'last month'
+}, {
+  label: '.editorconfig',
+  icon: 'i-heroicons-document-solid',
+  badge: 'Initial commit',
+  time: '2 years ago'
+}, {
+  label: '.package.json',
+  icon: 'i-heroicons-document-solid',
+  badge: 'chore(deps): bump',
+  time: '16 hours ago'
+}]
+</script>
+
+<template>
+  <UVerticalNavigation
+    :links="links"
+    class="w-full"
+    :ui="{
+      label: 'truncate relative text-gray-900 dark:text-white flex-initial w-32 text-left'
+    }"
+  >
+    <template #badge="{ link }">
+      <div class="flex-1 flex justify-between relative truncate">
+        <div>{{ link.badge }}</div>
+        <div>{{ link.time }}</div>
+      </div>
+    </template>
+  </UVerticalNavigation>
+</template>

docs/components/content/examples/VerticalNavigationExampleDefaultSlot.vue

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+<script setup>
+const links = [{
+  label: 'Navigation',
+  children: [{
+    label: 'Vertical Navigation',
+    to: '/navigation/vertical-navigation'
+  }, {
+    label: 'Command Palette',
+    to: '/navigation/command-palette'
+  }]
+}, {
+  label: 'Data',
+  children: [{
+    label: 'Table',
+    to: '/data/table'
+  }]
+}]
+</script>
+
+<template>
+  <UVerticalNavigation :links="links">
+    <template #default="{ link }">
+      <div class="relative text-left w-full">
+        <div class="mb-2">
+          {{ link.label }}
+        </div>
+        <UVerticalNavigation v-if="link.children" :links="link.children" />
+      </div>
+    </template>
+  </UVerticalNavigation>
+</template>

docs/components/content/examples/VerticalNavigationExampleIconSlot.vue

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+<script setup>
+const types = {
+  bug: {
+    icon: 'i-heroicons-bug-ant-20-solid',
+    color: 'text-red-500'
+  },
+  docs: {
+    icon: 'i-heroicons-document-text-20-solid',
+    color: 'text-blue-500'
+  },
+  lock: {
+    icon: 'i-heroicons-lock-closed-20-solid',
+    color: 'text-gray dark:text-white'
+  },
+  default: {
+    icon: 'i-heroicons-question-mark-circle-20-solid',
+    color: 'text-green-500'
+  }
+}
+const links = [{
+  label: 'UDropdown and UPopover dropdown menu, dropdown will be obscured',
+  type: 'bug'
+}, {
+  label: 'Uncaught (in promise) ReferenceError: ref is not defined',
+  type: 'lock'
+}, {
+  label: 'Fully styled and customizable components for Nuxt.',
+  type: 'docs'
+}, {
+  label: 'Can I pass a tailwind color to UNotifications with `toast.add()` ?'
+}]
+</script>
+
+<template>
+  <UVerticalNavigation :links="links">
+    <template #icon="{ link }">
+      <UIcon v-if="link.type" :name="types[link.type].icon" :class="types[link.type].color" class="text-base" />
+      <UIcon v-else :name="types.default.icon" :class="types.default.color" class="text-base" />
+    </template>
+  </UVerticalNavigation>
+</template>