Restore margin between maintainer avatars (#1480)
Restore margin between maintainer avatars (#1480)

This fixes #1313
It also sets the max-height to 40px in the responsive view.
This is to make sure that the images always
stay square and do not become distorted (50px height vs 40px width)

* display maintainer images as flexbox

dstufft/warehouse,alex/warehouse,alex/warehouse,pypa/warehouse,alex/warehouse,pypa/warehouse,pypa/warehouse,dstufft/warehouse,alex/warehouse,dstufft/warehouse,alex/warehouse,pypa/warehouse,dstufft/warehouse