Update dead links in free-programming-books-langs-pl.md #9806
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This PR removes unused indexes, removes 1 dead link and replaces the rest of dead links with the last web archive versions and adds the 'archived' notations in the free-programming-books-pl.md file.
Following links have been removed:
Following indexes have been removed (empty):
I have not changed anything in any file except the one i have worked in.
Why is this valuable (or not)?
This is valuable because it mostly replaces the dead links with the archived versions and keeps covering the topics with the already limited amount of links in polish language.
Checklist:
Follow-up