Snappymail: a modern fork of Rainloop

[murgero]

@necrevistonnezr This snappymail certainly is snappy - this is because it's mobile-first now?

[girish]

@murgero not sure but there's a bunch of changes in https://github.com/the-djmaze/snappymail#removal-of-old-javascript and also the css changes below it.