remove course link (#2697)

free-programming-books.md

@@ -1238,7 +1238,6 @@ Kerridge (PDF) (Just fill the fields with any values)
 * [Haskell and Yesod](http://www.yesodweb.com/book-1.4)
 * [Haskell no panic](http://lisperati.com/haskell/)
 * [Haskell web Programming](http://yannesposito.com/Scratch/fr/blog/Yesod-tutorial-for-newbies/) (Yesod tutorial)
-* [Introduction to Haskell](http://www.seas.upenn.edu/~cis194/spring13/) - Brent Yorgey
 * [Learn Haskell Fast and Hard](http://yannesposito.com/Scratch/en/blog/Haskell-the-Hard-Way/)
 * [Learn You a Haskell for Great Good](http://learnyouahaskell.com) - Miran Lipovaca
 * [Parallel and Concurrent Programming in Haskell](http://chimera.labs.oreilly.com/books/1230000000929/index.html) -  Simon Marlow