[SPARK-30880][DOCS] Delete Sphinx Makefile cruft#27625

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nchammas wants to merge 5 commits intoapache:masterfrom

nchammas:SPARK-30731-makefile-cleanup

Commits on Feb 18, 2020

delete sphinx makefile cruft
nchammas
committed

Commits on Feb 19, 2020

Merge branch 'master' of https://github.com/apache/spark into SPARK-30731-makefile-cleanup
nchammas
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switch to minimal makefile per Hykjin's suggestion
nchammas
committed

Commits on Feb 21, 2020