[New feature] export VPHomeContent to provide content-adaptive layout

[peterroe]

Is your feature request related to a problem? Please describe.

Conveniently use content-adaptive layout in components on the home page

Describe the solution you'd like

.vitepress/theme/index.ts:

import HomePage from './component/HomePage'

export default {
  Layout: () => {
    return h(Theme.Layout, null, {
      'home-features-after': () => h(HomePage),
    })
  },

---

HomePage.vue:

<script setup lang="ts">
import{ VPHomeContent } from 'vitepress/theme'
</script>

<template>
	<VPHomeContent>
		<!-- my custom content -->
	</VPHomeContent>
</template>

Describe alternatives you've considered

No response

Additional context

No response

Validations

• Follow our Code of Conduct
• Read the docs.
• Read the Contributing Guidelines.
• Check that there isn't already an issue that asks for the same feature to avoid creating a duplicate.