Fix broken link for Windows Phone Course and move it to the courses section

books/free-programming-books-langs.md

@@ -2499,7 +2499,6 @@ That section got so big, we decided to split it into its own file, the [BY SUBJE
 
 * [Developing An Advanced Windows Phone 7.5 App That Connects To The Cloud](https://web.archive.org/web/20150709045622/http://download.microsoft.com/download/C/4/6/C4635738-5E06-4DF7-904E-BDC22AED2E58/Developing%20an%20Advanced%20Windows%20Phone%207.5%20App%20that%20Connects%20to%20the%20Cloud.pdf) - MSDN Library, David Britch, Francis Cheung, Adam Kinney, Rohit Sharma (PDF) (:card_file_box: *archived*)
 * [Windows Phone 8 Development Succinctly](https://www.syncfusion.com/resources/techportal/ebooks/windowsphone8) - Matteo Pagani (PDF)
-* [Windows Phone 8.1 Development for Absolute Beginners](http://channel9.msdn.com/Series/Windows-Phone-8-1-Development-for-Absolute-Beginners)
 * [Windows Phone Programming Blue Book](http://www.robmiles.com/c-yellow-book/)
 
 

courses/free-courses-en.md

@@ -87,7 +87,7 @@
     * [Deno](#deno)
 * [Verilog / VHDL / SystemVerilog](#verilog--vhdl--systemverilog)
 * [Web Development](#web-development)
-
+* [Windows Phone](#windows-phone)
 
 ### 0 - MOOC
 
@@ -1121,3 +1121,7 @@
 * [Web Development Tutorials for Beginners](https://www.youtube.com/playlist?list=PLoYCgNOIyGAB_8_iq1cL8MVeun7cB6eNc) - LearnCode.academy
 * [Web Information Retrieval](https://www.youtube.com/playlist?list=PLAQopGWlIcya-9yzQ8c8UtPOuCv0mFZkr) - L. Becchetti, A. Vitaletti (University of Sapienza Rome)
 * [Web Programming](https://open.cs.uwaterloo.ca/web-programming/) - Centre for Education in Math and Computing (University of Waterloo)
+
+### Windows Phone
+
+* [Windows Phone 8.1 Development for Absolute Beginners](https://web.archive.org/web/20150213035325/http://channel9.msdn.com/Series/Windows-Phone-8-1-Development-for-Absolute-Beginners) - Bob Tabor, Matthias Shapiro, Larry Lieberman (Channel 9, MSDN) (:card_file_box: *archived*)