Removed sub-headers from the documentation's index page
Removed sub-headers from the documentation's index page

Except for the writing-a-locustfile page. This makes it more clear what's important within the docs.

Diogo-Costa/locust,cpennington/locust,santiavenda2/locust,yangchaogit/locust,scalp42/locust,liubq919/locust,yangchaogit/locust,agoragames/locust,scalp42/locust,moongtaeng/locust,minhoryang/locust,pglass/locust,kentzzhang/locust,agoragames/locust,kyroskoh/locust,Diogo-Costa/locust,jacobgardner/locust,rackerlabs/locust,wndhydrnt/locust,lixar/locust,kentzzhang/locust,rohitgup14/locust,leo23/locust,edx/locust,donglei/locust,leo23/locust,fordhurley/locust,fengshao0907/locust,locustio/locust,kentzzhang/locust,minhoryang/locust,pan1cz/locust,rohitgup14/locust,moongtaeng/locust,cloudant/locust,wndhydrnt/locust,fengshao0907/locust,scalp42/locust,lixar/locust,timaakulich/locust,nagyistoce/locust,moongtaeng/locust,cpennington/locust,kyroskoh/locust,nagyistoce/locust,rackerlabs/locust,dmoliveira/locust,cgoldberg/locust,harrisonfeng/locust,donglei/locust,wndhydrnt/locust,doctoryes/locust,noif/locust,harrisonfeng/locust,rohitgup14/locust,fengshao0907/locust,santiavenda2/locust,TZer0/locust,moongtaeng/locust,noif/locust,ismail-s/locust,armersong/locust,cgoldberg/locust,noif/locust,bugsduggan/locust,cloudant/locust,leo23/locust,kentzzhang/locust,liubq919/locust,pmdarrow/locust,normanb/locust,dmoliveira/locust,noif/locust,normanb/locust,pan1cz/locust,fordhurley/locust,edx/locust,jaume-pinyol/locust,mbeacom/locust,Diogo-Costa/locust,jaume-pinyol/locust,timaakulich/locust,rohitgup14/locust,yangchaogit/locust,RollForReflex/locust,locustio/locust,mbeacom/locust,doctoryes/locust,donglei/locust,pan1cz/locust,jaume-pinyol/locust,bugsduggan/locust,edx/locust,lixar/locust,mbeacom/locust,dmoliveira/locust,jacobgardner/locust,pglass/locust,TZer0/locust,donglei/locust,cpennington/locust,bugsduggan/locust,santiavenda2/locust,dmoliveira/locust,normanb/locust,armersong/locust,doctoryes/locust,wndhydrnt/locust,agoragames/locust,yangchaogit/locust,fordhurley/locust,locustio/locust,armersong/locust,pmdarrow/locust,Diogo-Costa/locust,jacobgardner/locust,heyman/locust,RollForReflex/locust,RollForReflex/locust,nagyistoce/locust,minhoryang/locust,timaakulich/locust,mbeacom/locust,lixar/locust,pmdarrow/locust,fengshao0907/locust,ismail-s/locust,harrisonfeng/locust,rackerlabs/locust,cpennington/locust,RollForReflex/locust,pglass/locust,kyroskoh/locust,armersong/locust,doctoryes/locust,locustio/locust,liubq919/locust,cgoldberg/locust,ismail-s/locust,cloudant/locust,leo23/locust,cloudant/locust,TZer0/locust,edx/locust