Added edit to chain messages, some CSS changes

At the moment chain messages can be edited, although there is no
notification that it has been edited, however, at the moment I think
that's a minor detail.

I changed around some minor styling, including at the 1366 resolution
that half the guys are using, and updated Mashabout to a 'Christmas
Edition' for the fuck of it.

Pretty good session, ironed out a few things.

BTW, Modulus had an outage today which was actually linked to AWS
servers going down, so that's something to keep in mind - with an
increase in the number of dependencies the number of potential failure
points increase.