Background and Instructions

I edited the background and instructions sections a little bit to make
them for kid friendly. I also uploaded a little info picture to the
background section to add visual appeal. I will do the same thing for
the instructions section and maybe the game over/win screens as well. I
just need help putting the image in the correct spot.
added images to gameplay
minor update to image
Merge remote-tracking branch 'origin/master' into Steph