Remove EmberConf callout.
Remove EmberConf callout.

As requested by @wifelette, since EmberConf is current sold out do not
display the logo/link on the homepage.

quangv/website,EricSchank/website,bmac/website,cyberkoi/website,maxcal/website,shearwater-intl/website,mrjavascript/website,Nick-Cotter/aboutme,zeppelin/emberjs-website,elwayman02/website,datajohnny/website,josemarluedke/ember-website,greyhwndz/website,Eric-Guo/website,AaronSikes/website,cyberkoi/website,duggiefresh/website,jimmay5469/website,ktornwall/website,davidpett/website,maxcal/website,AaronSikes/website,davidpett/website,martndemus/website,raycohen/website,duggiefresh/website,bmac/website,mrjavascript/website,EricSchank/website,MinxianLi/ember,wifelette/website,zeppelin/emberjs-website,rwjblue/website,workmanw/ember-website,elidupuis/website,kkenan/website,duggiefresh/website,josemarluedke/ember-website,zeppelin/emberjs-website,EricSchank/website,davidpett/website,maxcal/website,SaladFork/emberjs-website,greyhwndz/website,workmanw/ember-website,cllns/emberjs-website,elidupuis/website,datajohnny/website,shearwater-intl/website,MinxianLi/ember,jimmay5469/website,elwayman02/website,AaronSikes/website,MinxianLi/ember,cllns/emberjs-website,rwjblue/website,balupton/ember-website,tmock12/website,balupton/ember-website,josemarluedke/ember-website,knownasilya/website,josemarluedke/ember-website,Nick-Cotter/aboutme,balupton/ember-website,SaladFork/emberjs-website,elwayman02/website,jimmay5469/website,workmanw/ember-website,kkenan/website,Eric-Guo/website,tmock12/website,raycohen/website,cyberkoi/website,koriroys/emberjs-website,bmac/website,martndemus/website,mrjavascript/website,quangv/website,kpfefferle/website,koriroys/emberjs-website,SaladFork/emberjs-website,raycohen/website,Eric-Guo/website,kpfefferle/website,AgilionApps/website,workmanw/ember-website,cllns/emberjs-website,datajohnny/website,knownasilya/website,koriroys/emberjs-website,greyhwndz/website,AgilionApps/website,wifelette/website,AgilionApps/website,ktornwall/website,SaladFork/emberjs-website,bmac/website,kkenan/website,zeppelin/emberjs-website,martndemus/website,tmock12/website,praxxis/website,wifelette/website,praxxis/website,quangv/website,shearwater-intl/website,ktornwall/website,elidupuis/website,kpfefferle/website