ARROW-15601: [Docs][Release] Update post release script to move stable docs + keep dev docs#12355

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jorisvandenbossche wants to merge 7 commits intoapache:masterfrom

jorisvandenbossche:ARROW-15601

Commits on Feb 7, 2022

ARROW-15601: [Docs][Release] Update post release script to move stable docs + keep dev docs
jorisvandenbossche
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Commits on Feb 17, 2022

Merge remote-tracking branch 'upstream/master' into ARROW-15601
jorisvandenbossche
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only copy stable to previous docs for major release
jorisvandenbossche
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