Removed the example in the index of docs
Removed the example in the index of docs

It wasn't very useful and was always out of date.

drandykass/fatiando,eusoubrasileiro/fatiando,santis19/fatiando,mtb-za/fatiando,fatiando/fatiando,cmeessen/fatiando,fatiando/fatiando,eusoubrasileiro/fatiando,eusoubrasileiro/fatiando,eusoubrasileiro/fatiando_seismic,cmeessen/fatiando,rafaelmds/fatiando,drandykass/fatiando,mtb-za/fatiando,eusoubrasileiro/fatiando_seismic,victortxa/fatiando,victortxa/fatiando,santis19/fatiando,rafaelmds/fatiando