Add link to WebGL Insights book (#3109)

* Add link to WebGL Insights book * delint - spaces and trailing slash
6 years ago · efd39927b6
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 * [OpenGL](http://www.songho.ca/opengl/index.html) - Concepts and illustrations.
 * [ShaderX series](http://www.realtimerendering.com/resources/shaderx/) - Wolfgang Engel
 * [Tutorials for modern OpenGL](http://www.opengl-tutorial.org)
+* [WebGL Insights](http://webglinsights.com) - Patrick Cozzi and Contributors


 ### Graphical User Interfaces