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>
pull/9651/merge
Bryan Kimani 1 year ago committed by GitHub
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      more/free-programming-interactive-tutorials-en.md

@ -403,6 +403,7 @@
### Ruby ### Ruby
* [A Brief Introduction to Ruby](https://markm208.github.io/rubybook) - Mark Mahoney
* [CodeCademy Ruby](https://www.codecademy.com/learn/ruby) * [CodeCademy Ruby](https://www.codecademy.com/learn/ruby)
* [Ruby Koans](http://www.rubykoans.com) * [Ruby Koans](http://www.rubykoans.com)
* [The Odin Project](http://www.theodinproject.com) * [The Odin Project](http://www.theodinproject.com)

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