chore: remove docs from core repo

[balazsorban44]

From now, all new Documentation related PRs should be opened against https://github.com/nextauthjs/docs

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[codecov-commenter]

Codecov Report

Merging #2609 (75cb7cb) into next (a49903f) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             next    #2609   +/-   ##
=======================================
  Coverage   13.96%   13.96%           
=======================================
  Files          85       85           
  Lines        1325     1325           
  Branches      379      379           
=======================================
  Hits          185      185           
  Misses        951      951           
  Partials      189      189           

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