DOC: reorganizing contributing docs to clean up toc, better separate topics#27265

Merged

timhoffm merged 3 commits intomatplotlib:mainfrom

story645:dev_shuffle

Dec 20, 2023

Commits on Dec 19, 2023

moved coding guide contents to pr guide, cleaned up some checklists in
story645
committed
moved coding guide out of contribute to its own page
story645
committed

Commits on Dec 20, 2023

reorganizing contributing docs to clean up toc

story645
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melissawm
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