Update free-programming-books-langs.md (#10343)

* Add introduction to ruby ebook

* Add Rails n+1 queries basics ebook

* Move the Brief Introduction to Ruby to interactive tutorials

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Co-authored-by: kimanifinplus <kimani@finplusgroup.com>
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Bryan Kimani 2023-10-21 17:04:24 +03:00 committed by GitHub
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### Ruby
* [A Brief Introduction to Ruby](https://markm208.github.io/rubybook) - Mark Mahoney
* [CodeCademy Ruby](https://www.codecademy.com/learn/ruby)
* [Ruby Koans](http://www.rubykoans.com)
* [The Odin Project](http://www.theodinproject.com)