feat(plugin-auto-nav-sidebar)!: when no _meta.json, index.md should be used as dir link

[SoonIter]

Summary

1. THIS is a breaking change, treat index as dir link in default

• when no _meta.json, treat index as dir link (breaking change)
• no index in _meta.json, treat index as dir link
• index in _meta.json, treat index as child sidebar as before

if you want to fallback to old behavior, please add a _meta.json and add the index file to it, then, index page would be placed to child sidebar

// _meta.json
["index", "guide"]

2. by the way, refactor the Overview comp to pass the CI, and It will be compatible with this situation and more regular.

Related Issue

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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