Support multi-level sidebar

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

yes

Describe the solution you’d like

 {
   "text":"level1",
   "collapsible":true,
   "collapsed":false,
   "items":[
      {
         "text":"level1-1",
         "collapsible":true,
         "collapsed":false,
         "items":[
            {
               "text":"level1-1-1 ",
               "link":"/01.1"
            },
            {
               "text":"level1-1-2 ",
               "link":"/01.2"
            }
         ]
      },
      {
         "text":"level1-2",
         "collapsible":true,
         "collapsed":false,
         "items":[
            {
               "text":"level1-2-1 ",
               "link":"/02.1"
            },
            {
               "text":"level1-2-2 ",
               "link":"/02.2"
            }
         ]
      }
   ]
}

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.

[brc-dd]

#851 should fix this

[brc-dd]

prev page & next page navigator is wrong.

What’s the issue?

How do I turn off bottom navigation

Add some style like .VPDocFooter { display: none; }