Vuepress 2 support

[GreenImp]

Is your feature request related to a problem? Please describe. The sidebar config has changed slightly in Vuepress v2, which means that this library no longer generates a sidebar config that is compatible with Vuepress 2.

The docs for v2 are here: https://v2.vuepress.vuejs.org/reference/default-theme/config.html#sidebar

Firstly, the title property has been changed to text. Another issue, that doesn't appear to be documented, is that the link strings need to be the full path, rather than just the relative path.

With a structure like:

/code/
  - file-a.md
  - file-b.md
  sub-directory/
    - file-c.md

The sidebar is currently generated as:

{
  '/code/': [
    {
      title: 'Code',
      children: [['', '' + title + ''], 'file-a', 'file-b'],
    }
    {
      title: 'sub-directory',
      children: ['sub-directory/file-c'],
    }
  ],
}

When navigating into the sub-directory, the links to the root directory get changed like sub-directory/file-a, which is broken. To fix it, it needs to be like this:

{
  '/code/': [
    {
      text: 'Code',
      children: [{link: '/code/', text: '' + title + ''}, '/code/file-a', '/code/file-b'],
    }
    {
      text: 'sub-directory',
      children: ['/code/sub-directory/file-c'],
    }
  ],
}

Note above that the root level first link has also been changed to an object - it looks like the array style used before also no longer works.

Describe the solution you'd like For the library to export the config in a way that is compatible with VuePress v2.

Describe alternatives you've considered I'm not really sure there are other alternatives :shrug:

Additional context I would be happy to work on a PR for this, but I've not used Typescript before, so It could take a while to figure out how. I'm guessing that it's this file that needs modifying? https://github.com/ph1p/vuepress-jsdoc/blob/21823a1c56b0fa29c2077321203a9a4556b8e210/src/lib/vue-sidebar.ts