Updated cli instructions
Updated cli instructions

`dir` is no longer relevant (`ls` exists on both powershell and mingw), also made references to directory consistent and linked to learncodethehardway cli guide.
bjaus/hellowebapp,SoItGoes33/hellowebapp,SoItGoes33/hellowebapp,hellowebapp/hellowebapp,kajayi/hellowebapp,kajayi/hellowebapp-2,kajayi/hellowebapp,hellowebapp/hellowebapp,bjaus/hellowebapp,kajayi/hellowebapp-2