Make the repo+site more SFW

[increpare]

[ If anyone has any comments on this, email me directly (analytic@gmail.com) rather than commenting here. ]

[increpare]

(I decided to replace the blurred out gif mentioned in fefcdb9 with a static text image in the end, but forgot to update the commit message)

[increpare]

I think I'll crop the thumbnail to something less explicit (an inoccuous animation stands out less than the [ADULT CONTENT] image) and not have the silly date-picker.