migrate recoding benchmark to PLNK

this MR

• moves the last "recoding" benchmark to examples/benches/
• moves the README, which is now all alone, to examples/benches/
• adds a mention to examples/benches/README.md in README.md
• some minor improvements to the bench README

TODO

• find a way to plot the "recoding" results (thanks to !90 (merged))

marked this merge request as draft

changed the description

added 2 commits

• c5a3e4c1 - simplify README
• 91968c46 - add script to plot the recoding results

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marked this merge request as ready

mentioned in commit c72f979a

added 3 commits

• b3449155 - 1 commit from branch main
• c72f979a - Merge branch 'main' into migrate-recoding-benchmark-to-pnlk
• a9063e8e - add some styling to the "recoding" plot

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changed the description

enabled an automatic merge when the pipeline for a9063e8e succeeds

merged

mentioned in commit 22f7943d