removed ULK
Merge pull request #1173 from vjananth89/master

removed Understanding Linux Kernel
Apprendre jQuery
Merge pull request #1174 from AndreiCurelaru/master

Added : "Apprendre jQuery"  French side
Added Try Racket tutorial to interactive section
Added How to Design Programs to Racket section.
Merge pull request #1175 from jarcane/patch-1

Added Try Racket tutorial to interactive section
Merge pull request #1176 from jarcane/master

Added How to Design Programs to Racket section.