feat: toc

[poyoho]

fix: #794

config sidebar

{
  text: 'TOC2',
  toc: '/toc2/',
  items: [
    {
      text: 'Multiple levels outline - 2',
      link: '/frontmatter/multiple-levels-outline'
    },
    {
      text: 'Test Nested TOC - 2',
      items: [
        {
          text: 'Hello1 - 2',
          link: '/toc2/hello'
        },
      ]
    },
    {
      text: 'Hello2 - 2',
      link: '/toc2/hello2'
    },
  ]
}

and then add the index.md into /toc2/

---
sidebar: false
page: true
footer: false
---

<script setup>
import { VPToc } from 'vitepress/theme'
</script>

<VPToc />

[kiaking]

Closing due to its becoming obsolete. We do want this feature, but I think we should discuss "how" and API and such. Let's follow up on #794