added guide for creating a kdapps through cli
updated documentation
updated links
spelling, grammar fixes
Merge pull request #15 from glang/master

wordpress guide
improved the guide by adding some additional text
moved devtools cli into its creating apps section
headline change
Merge pull request #16 from bvallelunga/devtools-cli

Added Devtools CLI Guide
Corrected the guide name and added it to sidebar.
cockpit guide