Downscale home page featured images

Remove the position:absolute style.  It doesn't seem to be needed to
"crop" tall images with CSS and it keeps the image from being scaled down
to the max-width of the container.

Closes #599
Merge branch 'master' into develop
Merge branch 'develop' into 515-publish_cleanup
Rebuild CSS

I forgot to rebuild CSS in c0cf382265c5620e1d0be26180526980a7ee55f9

Addresses #515