MixeroTN 8ac0fe6088
Update dead links in free-programming-books-langs-pl.md (#9806)
* Replace dead links with the web archive ones (pl)

* Add 'archived' notations (pl)

ccd767571c/docs/CONTRIBUTING.md (archived)

* Remove empty indexes (pl)
2023-10-03 13:18:33 -04:00
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