refactor(theme): new sidebar match algorithm and export SidebarList UI only component

[SoonIter]

Summary

1. refactor sidebar matchPath algorithm, the old one is too hard to understand

now

assumes that user's sidebar is as below

sidebar: {
    "/guide/": [
        {
            "text": "指南",
            "items": [
                {
                    "text": "快速上手",
                    "link": "/guide/quick-start"
                },
                {
                    "text": "安装",
                    "link": "/guide/install"
                }
            ],
            "link": "",
            "collapsed": false,
            "collapsible": true
        }
    ]
}

the route which hits matchPath("/guide/", currentPathname) /guide/* would be shown

e.g: under '/guide/quick-start.html' would show the sidebar["/guide"]

before

if route hits one item in this config

e.g: "/guide/quick-start/index.html" hits {"text": "快速上手", "link": "/guide/quick-start" }

and sidebar["/guide"] would be shown

In fact, the new algorithm will be more fast in performance, and I think there aren't cases that's not be covered

2. extract SidebarList UI only component for better maintainability and someone wants to customize sidebar UI

[netlify]

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