docs: Re-organise for new docs layout (v3)

[lachlancollins]

Restructures docs to work with v2 layout

I've also removed the next app from the docs directory, leaving only the config.json and the markdown files

See also: TanStack/tanstack.com#151

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Name	Status	Preview	Comments	Updated (UTC)
query	⬜️ Ignored (Inspect)	Visit Preview		Jan 25, 2024 9:01am

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Codecov Report

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Additional details and impacted files

@@          Coverage Diff          @@
##             v3    #6765   +/-   ##
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  Coverage      ?   96.36%           
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  Files         ?       45           
  Lines         ?     2281           
  Branches      ?      640           
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  Hits          ?     2198           
  Misses        ?       80           
  Partials      ?        3           

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