[app/content][s]: cleaner start page and remove reference to non-existent tutorial.
[app/content][s]: cleaner start page and remove reference to non-existent tutorial.

gotjoshua/recline,okfn/recline,boban-dj/recline,rjsteinert/recline,acouch/recline,maxogden/recline,acouch/recline,okfn/recline,huangciyin/reclinejs-requirejs,beni55/recline,NuCivic/recline.js,NuCivic/recline.js,gotjoshua/recline,huangciyin/reclinejs-requirejs,NuCivic/recline.js,rjsteinert/recline,rjsteinert/recline,modulexcite/recline,acouch/recline,modulexcite/recline,okfn/recline,beni55/recline,maxogden/recline,GerHobbelt/recline,GerHobbelt/recline,modulexcite/recline,gotjoshua/recline,beni55/recline,boban-dj/recline,GerHobbelt/recline,boban-dj/recline