Delete papi_library.md

this never made it to env/scs5, so maybe we should get rid of it

assigned to @mflehmig--tu-dresden.de

requested review from @wesarg--tu-dresden.de

maybe @fwinkler--tu-dresden.de can give it a minimal overhaul?

please drop the link in docs/software/software_development_overview.md

mentioned in issue #45 (closed)

added 1 commit

• e8701a6d - Remove link to deleted page

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merged

mentioned in commit 70fcd457