Merge branch 'rohlfing-patch-remove-pypdf2' into 'master'

Remove pypdf2 from requirements.txt and documents

See merge request !41
6 jobs for master in 5 minutes and 46 seconds (queued for 3 seconds)
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  Build
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  Deploy
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passed pages:deploy

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failed pages:deploy

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  Test
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passed test-coverage #1645306

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