Fix EbookFoundation#2073

Author: vhf

free-programming-books.md

@@ -489,7 +489,6 @@
 * [PNG: The Definitive Guide](http://www.libpng.org/pub/png/book/)
 * [Pointers And Memory](http://cslibrary.stanford.edu/102/PointersAndMemory.pdf) (PDF)
 * [Principles of Computer System Design ](http://ocw.mit.edu/resources/res-6-004-principles-of-computer-system-design-an-introduction-spring-2009/online-textbook/part_ii_open_5_0.pdf) (PDF)
-* [Programmer's Motivation for Beginners](http://programmersmotivation.com)
 * [Programming with Unicode](http://unicodebook.readthedocs.org)
 * [Project Oberon](http://www.ethoberon.ethz.ch) (PDF)
 * [Record-Playback Test Automation: Sahi & Selenium IDE: Critical Evaluation of Record-Playback Automation Tools](https://leanpub.com/manualToAutomatedWithSeleniumIDEAndSahi) - Shashikant Jagtap