Removed broken links (#7309)

* Removed broken links

* recover and archive `Praxiswissen Ruby` book

* recover and archive `Einstieg in Visual Basic 2010` book

Co-authored-by: David Ordás <3125580+davorpa@users.noreply.github.com>
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Julian Ste 2 years ago committed by GitHub
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      books/free-programming-books-de.md

@ -207,7 +207,7 @@
### Ruby on Rails ### Ruby on Rails
* [Praxiswissen Ruby](http://www.oreilly.de/german/freebooks/rubybasger/pdf_rubybasger.pdf) (PDF) * [Praxiswissen Ruby](https://web.archive.org/web/20160328183933/https://oreilly.de/german/freebooks/rubybasger/pdf_rubybasger.pdf) - Sascha Kersken (PDF) *(:card_file_box: archived)*
* [Praxiswissen Ruby On Rails](http://examples.oreilly.de/openbooks/pdf_rubyonrailsbasger.pdf) - Denny Carl (PDF) * [Praxiswissen Ruby On Rails](http://examples.oreilly.de/openbooks/pdf_rubyonrailsbasger.pdf) - Denny Carl (PDF)
* [Rails Kochbuch](http://examples.oreilly.de/openbooks/pdf_railsckbkger.pdf) - Rob Orsini (PDF) * [Rails Kochbuch](http://examples.oreilly.de/openbooks/pdf_railsckbkger.pdf) - Rob Orsini (PDF)
* [Ruby on Rails 2](http://openbook.rheinwerk-verlag.de/ruby_on_rails/) - Hussein Morsy, Tanja Otto (Online) * [Ruby on Rails 2](http://openbook.rheinwerk-verlag.de/ruby_on_rails/) - Hussein Morsy, Tanja Otto (Online)

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