Update free-programming-books-de.md (#9286)

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### Delphi
* [Delphi-Starter](https://web.archive.org/web/https://downloads.delphi-treff.de/DelphiStarter.pdf) - Florian Hämmerle, Martin Strohal, Christian Rehn, Andreas Hausladen (PDF) *(:card_file_box: archived)*
* [Delphi-Starter](https://web.archive.org/web/20170714162427/https://downloads.delphi-treff.de/DelphiStarter.pdf) - Florian Hämmerle, Martin Strohal, Christian Rehn, Andreas Hausladen (PDF) *(:card_file_box: archived)*
### Git